According to Aristotelian essentialism, the nature of an organism is constituted of a particular goal-directed disposition to produce an organism typical of its kind. This paper argues—against the prevailing orthodoxy—that essentialism of this sort is indispensable to evolutionary biology. The most powerful anti-essentialist arguments purport to show that the natures of organisms play no explanatory role in modern synthesis biology. I argue that recent evolutionary developmental biology provides compelling evidence to the contrary. Developmental biology shows that one must appeal to (...) the capacities of organisms to explain what makes adaptive evolution adaptive. Moreover, the specific capacities in question are precisely those that, according to Aristotle, constitute the nature of an organism. Essentialism 1.1 Aristotelian biological kinds Evolutionary anti-essentialism 2.1 Taxonomic anti-essentialism 2.2 Explanatory anti-essentialism Adaptation 3.1 Stability 3.2 Mutability 3.3 Phenotypic plasticity and adaptive evolution The natures of organisms Conclusion. (shrink)

The fact that humans have a special relationship to each other insofar as they belong in the same species is often taken to be a morally relevant difference between humans and other animals, one which justifies a greater moral status for all humans, regardless of their individual capacities. I give some reasons why this kind of relationship is not an appropriate ground for differential treatment of humans and nonhumans. I then argue that even if relationships do matter morally species membership (...) cannot justify a difference in moral status. This has important implications because it removes one barrier to giving animals greater moral status. (shrink)

Moral status is the moral value that something has in its own right, independently of the interests or concerns of others. Research using human embryonic stem cells implicates issues about moral status because the current method of extracting hESCs involves the destruction of a human embryo, the moral status of which is contested. Moral status issues can also arise, however, when hESCs are transplanted into embryonic or fetal animals, thereby creating human/ nonhuman stem cell chimeras. In particular, one concern about (...) chimera research is that it could confer upon an animal the moral status of a normal human adult, but then impermissibly fail to accord the animal the protections it merits in virtue of its enhanced status. Understanding the public policy implications of this ethical conclusion is complicated by the fact that certain views about the moral status of the embryo cannot legitimately be used to justify public policy decisions. Arguments like those employed in the abortion debate for the conclusion that abortion should be legally permissible even if abortion is not morally permissible also support, to a more limited degree, a liberal policy on hESC research involving the creation of chimeras. (shrink)

: Experiments involving the transplantation of human stem cells and their derivatives into early fetal or embryonic nonhuman animals raise novel ethical issues due to their possible implications for enhancing the moral status of the chimeric individual. Although status-enhancing research is not necessarily objectionable from the perspective of the chimeric individual, there are grounds for objecting to it in the conditions in which it is likely to occur. Translating this ethical conclusion into a policy recommendation, however, is complicated by the (...) fact that substantial empirical and ethical uncertainties remain about which transplants, if any, would significantly enhance the chimeric individual's moral status. Considerations of moral status justify either an early-termination policy on chimeric embryos, or, in the absence of such a policy, restrictions on the introduction of pluripotent human stem cells into early-stage developing animals, pending the resolution of those uncertainties. (shrink)

Experiments involving the transplantation of human stem cells and their derivatives into early fetal or embryonic nonhuman animals raise novel ethical issues due to their possible implications for enhancing the moral status of the chimeric individual. Although status-enhancing research is not necessarily objectionable from the perspective of the chimeric individual, there are grounds for objecting to it in the conditions in which it is likely to occur. Translating this ethical conclusion into a policy recommendation, however, iscomplicated by the fact that (...) substantial empirical and ethical uncertainties remain about which transplants, if any, would significantly enhance the chimeric individual’s moral status. Considerations of moral status justify either an early-termination policy on chimeric embryos, or, in the absence of such a policy, restrictions on the introduction of pluripotent human stem cells into early-stage developing animals, pending the resolution of those uncertainties. (shrink)

Ernst Mayr has argued that Darwinian theory discredited essentialist modes of thought and replaced them with what he has called "population thinking". In this paper, I characterize essentialism as embodying a certain conception of how variation in nature is to be explained, and show how this conception was undermined by evolutionary theory. The Darwinian doctrine of evolutionary gradualism makes it impossible to say exactly where one species ends and another begins; such line-drawing problems are often taken to be the decisive (...) reason for thinking that essentialism is untenable. However, according to the view of essentialism I suggest, this familiar objection is not fatal to essentialism. It is rather the essentialist's use of what I call the natural state model for explaining variation which clashes with evolutionary theory. This model implemented the essentialist's requirement that properties of populations be defined in terms of properties of member organisms. Requiring such constituent definitions is reductionistic in spirit; additionally, evolutionary theory shows that such definitions are not available, and, moreover, that they are not needed to legitimize population-level concepts. Population thinking involves the thesis that population concepts may be legitimized by showing their connections with each other, even when they are not reducible to concepts applying at lower levels of organization. In the paper, I develop these points by describing Aristotle's ideas on the origins of biological variation; they are a classic formulation of the natural state model. I also describe how the development of statistical ideas in the 19th century involved an abandoning of the natural state model. (shrink)

Since its original publication in 1975, this groundbreaking work has awakened millions of concerned men and women to the shocking abuse of animals everywhere--inspiring a worldwide movement to eliminate much of the cruel and unnecessary laboratory animal experimentation of years past. In this newly revised and expanded edition, author Peter Singer exposes the chilling realities of today's "factory farms" and product-testing procedures--offering sound, humane solutions to what has become a profound environmental and social as well as moral issue. An important (...) and persuasive appeal to conscience, fairness, decency and justice, Animal Liberation is essential reading for the supporter and the skeptic alike.--From publisher description. (shrink)

When Mrs. Frederick C. Little's second son was born, everybody noticed that he was not much bigger than a mouse. (E. B. White, 1945, 1.) In every somatic and morphological detail Stuart Little was...

This paper critically examines the biology of species identity and the morality of crossing species boundaries in the context of emerging research that involves combining human and nonhuman animals at the genetic or cellular level. We begin with the notion of species identity, particularly focusing on the ostensible fixity of species boundaries, and we explore the general biological and philosophical problem of defining species. Against this backdrop, we survey and criticize earlier attempts to forbid crossing species boundaries in the creation (...) of novel beings. We do not attempt to establish the immorality of crossing species boundaries, but we conclude with some thoughts about such crossings, alluding to the notion of moral confusion regarding social and ethical obligations to novel interspecies beings. (shrink)

Biologists and philosophers of biology typically regard essentialism about speciesas incompatible with modern Darwinian theory. Analytic metaphysicians such asKripke, Putnam and Wiggins, on the other hand, believe that their essentialist thesesare applicable to biological kinds. I explore this tension. I show that standard anti-essentialist considerations only show that species do not have intrinsic essential properties. I argue that while Putnam and Kripke do make assumptions that contradict received biological opinion, their model of natural kinds, suitably modified, is partially applicable to (...) biological species. However, Wiggins'' thesis that organisms belong essentially to their species is untenable, given modern species concepts. I suggest that Putnam''s, Kripke''s and Wiggins'' errors stem from adopting an account of the point of scientific classification which implies that relationally-defined kinds are likely to be of little value, an account which is inapplicable to biology. (shrink)

It is a welcome development when academic philosophy starts to concern itself with practical issues, in such a way as to influence people's lives. Recently this has happened with one moral issue in particular—but infortunately it is the wrong issue, and people's actions have been influenced in the wrong way. The issue is that of the moral status and treatment of animals. A number of philosophers have argued for what they call ‘animal liberation’, comparing it directly with egalitarian causes such (...) as women's liberation and racial equality and suggesting that, if racism and sexism are rationally indefensible, so is ‘speciesism’. If one ought to give equal consideration to the interests of all human beings, then, so they daim, one must on the same grounds and in the same way recognize that ‘all animals are equal’, be they human or non-human. We believe that this assimilation of ‘animal liberation’ to human liberation movements is mistaken. (shrink)

One argument Robert and Baylis do not raise in their article on the creation of interspecies chimeras using human cellular material is that the creation of these chimeras would, or could, offend human dignity. Yet, human dignity is one of the most common concerns raised in public debates, academic arguments, and policy documents regarding biotechnology in general, and the creation animal-human chimeras in particular. … The concept is ill-defined within bioethics and … risks being dismissed as meaningless or uselessly vague. (...) However, this lack of definition should not yet cause us to abandon or ignore human dignity. At least in arguments about creating chimeras, an examination of what may be meant by appeals to human dignity can uncover important concerns or arguments that are not captured by other formulations of the debate. (shrink)

To date, ethics discussions about stem cell research overwhelmingly have centered on the morality and acceptability of using human embryonic stem cells. Governments in many jurisdictions have now answered these “first-level questions” and many have now begun to address ethical issues related to the donation of cells, gametes, or embryos for research. In this commentary, we move beyond these ethical concerns to discuss new themes that scientists on the forefront of NRM development anticipate, providing a preliminary framework for further discussion (...) between scientists and ethicists. Fostering strong partnerships between neuroscientists and ethicists that operate and collaborate within this evolving framework will maximize the translation of NRM discoveries on the brain into cures that are safe and address the needs of science and society. (shrink)

The article defends the doctrine that Linnaean taxa, including species, have essences that are, at least partly, underlying intrinsic, mostly genetic, properties. The consensus among philosophers of biology is that such essentialism is deeply wrong, indeed incompatible with Darwinism. I argue that biological generalizations about the morphology, physiology, and behavior of species require structural explanations that must advert to these essential properties. The objection that, according to current “species concepts,” species are relational is rejected. These concepts are primarily concerned with (...) what it is for a kind to be a species and throw little light on the essentialist issue of what it is for an organism to be a member of a particular kind. Finally, the article argues that this essentialism can accommodate features of Darwinism associated with variation and change. (shrink)

Discussions about whether new biomedical technologies threaten or violate human dignity are now common. Indeed, appeals to human dignity have played a central role in national and international debates about whether to allow particular kinds of biomedical investigations. The focus of this paper is on chimera research. I argue here that both those who claim that particular types of human-nonhuman chimera research threaten human dignity and those who argue that such threat does not exist fail to make their case. I (...) first introduce some of the arguments that have been offered supporting the claim that the creation of certain sorts of chimeras threatens or violates human dignity. I next present opponents' assessments of such arguments. Finally I critically analyze both the critics' and the supporters' claims about whether chimera research threatens human dignity. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Future Directions for Oversight of Stem Cell Research in the United States: An UpdateMary A. Majumder (bio) and Cynthia B. Cohen (bio)On 9 March 2009, President Barack Obama (2009a) signed an executive order revoking the statement issued by President George W. Bush during a televised speech in August 2001, in which the latter had sharply restricted the scope of federally funded human embryonic stem cell (hESC) research to cell (...) lines derived (without federal funding) prior to 9:00 P.M. EDT on 9 August 2001. Action by President Obama to remove the cut-off date had been expected. It came as a surprise, however, that he gave authority to determine the scope of eligible research to the Director of the National Institutes of Health (NIH), referencing only general concerns of responsibility, scientific worth, and legality.1 This contrasted not only with the approach of former President Bush, but also with that of former President Clinton, who had expressed personal opposition to the creation of embryos for research and had a distinction between hESCs derived from embryos created for research and those derived from spare embryos enshrined in NIH policy.President Obama’s remarks upon signing the executive order give some insight into the thinking behind his approach. Implicit in them are the views that earlystage human embryos outside the womb do not have full moral status and that the destruction of human embryos in the effort to care for and ease the suffering of human beings who do have full moral status does not devalue human life. The President also stressed that the decision to pursue hESC research reflected not only his opinion, but also a broad social consensus. He concluded with strong ethical commitments on two fronts:We will develop strict guidelines, which we will rigorously enforce, because we cannot ever tolerate misuse or abuse. And we will ensure that our government never opens the door to the use of cloning for human reproduction. It is dangerous, profoundly wrong, and has no place in our society, or any society.(Obama 2009b)The specific guarantee that President Obama gave against government support for the development of cloning techniques for human reproductive purposes made his silence on the use of cloning for research seem significant. Comments he had made in the course of the campaign (Obama 2008) suggested that he would affirm [End Page 195] the Clinton-era policy of limiting federal funding to hESCs derived from spare embryos. Did this silence mean that President Obama was opening the door to federal funding of research cloning when and if scientists might manage that feat?2009 NIH GuidelinesThe answer to this question and several others came on 17 April, when Raynard Kington, the acting director of NIH, released Draft NIH Guidelines for Human Stem Cell Research (NIH 2009), developed by an NIH Stem Cell Task Force, along with a request for public comment within 30 days of their publication in the Federal Register.2 The 2009 Draft Guidelines exclude from federal funding the derivation of hESCs, a restriction mandated by the reenactment of the Dickey-Wicker Amendment as part of the 2009 Omnibus Appropriations Act (Public Law 111-8, Division F, Title V, § 509). The 2009 Draft Guidelines also exclude the use of hESCs derived from embryos created for research purposes, and so represent a refusal to open the funding door as broadly as the NIH interpretation of the Dickey-Wicker Amendment might allow, at least for the time being.It appears that the drafters used as their starting point the 2000 NIH Guidelines for Research Using Human Pluripotent Stem Cells (NIH 2000) dating from the Clinton Administration, rather than more recent guidelines from the National Academy of Sciences (National Research Council 2005; 2007; 2008) and other private bodies. Both the format and content of the 2000 and 2009 NIH efforts are similar, making the departures in the latter stand out in high relief. We highlight departures related to informed consent to embryo donation, creation of human-nonhuman chimeras, and the role of an NIH task force, updating our original comment (Cohen and Majumder 2009).Informed Consent to Embryo DonationThe 2009 NIH Draft Guidelines require that certain statements... (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Future Directions for Oversight of Stem Cell Research in the United StatesCynthia B. Cohen (bio) and Mary A. Majumder (bio)Human pluripotent stem cell research, meaning research into cells that can multiply indefinitely and differentiate into almost all the cells of the body, has become a minefield in which science, ethics, and politics have collided over the last decade in the United States. President Barack Obama entered this highly charged (...) territory when he indicated during his campaign that once in office he would issue an executive order expanding federally funded human embryonic stem cell (hESC) research and introduce rigorous oversight of it (Obama 2008a & b). Candidate Obama stated that he would require that the hESC lines involved were derived with donor consent from early embryos that otherwise would be discarded following in vitro fertilization (IVF) treatment. However, in contrast with the policy of President George W. Bush, he would do so without regard to the date of their derivation. He added that he would call upon the director of the National Institutes of Health (NIH) to develop guidelines for federally funded hESC and other pluripotent stem cell research that would draw from the guidelines developed in 2005 by the National Academies of Science (NAS) for privately funded research (National Research Council 2005).A similar policy was written into the 2008 version of the Stem Cell Research Enhancement Act, which reiterates the policy enunciated in earlier versions of this bill, passed twice by the Congress but vetoed by President Bush each time (House of Representatives, 110th Congress 2008).1 Depending on how one reads the 2008 version of the act, it could also apply in certain respects to hESC research that is not federally funded. We proceed on the assumption that the act applies at least to federally funded stem cell research. Therefore, it appears that the president or the Congress, or both, will approve of an expanded policy of federal funding of hESC research, as well as other forms of human pluripotent stem cell research. [End Page 79]This policy would make the guidelines developed by a committee appointed by NAS, a prestigious private body of American scientists and related experts, the primary basis for the development of new federal guidelines for oversight of hESC research in the United States. This would have certain advantages in that those familiar with the relevant scientific issues are likely to address them accurately and stem cell investigators are apt to accept restrictions on their research written by fellow scientists and ethics and policy experts whom they perceive as strong supporters of stem cell research. However, it also would have certain disadvantages. Chief among these is that the NAS committee appointed to write guidelines for this research, in its concern to see stem cell science move forward after a period in which many scientists and others maintained that it had been unduly restricted, might have overlooked or deferred consideration of some pressing ethical and policy issues. We maintain that this is the case—although we also maintain that the NAS guidelines provide a responsible foundation for developing NIH guidelines for stem cell research. Consequently, we propose that an NIH task force charged by the director of NIH with writing new guidelines for hESC and other stem cell research should revise and expand the NAS guidelines in ways that we propose below, as well as others that it considers necessary, and make it obligatory for those seeking federal funding of such research to follow these new guidelines.We highlight certain areas in which an ethical case can be made for strengthening the existing NAS guidelines and certain areas in which more fundamental ethical reflection—and building on that, additional guideline/policy development—seems warranted. Among the sections of the NAS guidelines that need clarification and reworking, we include those regarding consent to embryo donation, which provide one of their central focuses, and the development of human-nonhuman chimeras, which they address relatively briefly. In addition, we maintain that new guidelines need to be written to address the nascent ethical and policy issues raised by the possibility that human gametes will be induced from pluripotent stem cells in the next few years and that... (shrink)

Much bioethical discussion has been devoted to the subject of human enhancement through various technological means such as genetic modification. Although many of the same technologies could be, indeed in many cases already have been, applied to non-human animals, there has been very little consideration of the concept of “animal enhancement”, at least not in those specific terms. This paper addresses the notion of animal enhancement and the ethical issues surrounding it. A definition of animal enhancement is proposed that provides (...) a framework within which to consider these issues; and it is argued that if human enhancement can be considered to be a moral obligation, so too can animal enhancement. (shrink)

In January 2008, the Human Fertilisation and Embryology Authority issued two 1-year licenses for cytoplasmic hybrid embryo research. This article situates the HFEA's decision in its wider scientific and political context in which, until quite recently, the debate about human embryonic stem cell research has focused narrowly on the moral status of the developing human embryo. Next, ethical arguments against crossing species boundaries with humans are canvassed. Finally, a new argument about the risks of harm to women egg providers resulting (...) from research involving the creation of humanesque cytoplasmic hybrid embryos is elaborated. Taken together these ethical concerns about the moral status of the human embryo, about the ethics of crossing species boundaries with humans, and about the potential harms to women, provide good reason to eschew humanesque cytoplasmic hybrid embryo research in favor of less ethically controversial means to the laudable end of successful regenerative medicine. (shrink)

Over the last 2,300 years or so, many philosophers have believed that species are individuated by essences that are at least in part intrinsic. Psychologists tell us most folks also believe this view. But most philosophers of biology have abandoned the view, in light of evolutionary conceptions of species. In defiance, Michael Devitt has attempted in this journal to resurrect a version of the view, which he calls Intrinsic Biological Essentialism. I show that his arguments for the resurrection fail, and (...) I identify challenges that face anyone wishing to defend Intrinsic Biological Essentialism. (shrink)

The question of whether biologists should continue to use the Linnaean hierarchy has been a hotly debated issue. Invented before the introduction of evolutionary theory, Linnaeus's system of classifying organisms is based on outdated theoretical assumptions, and is thought to be unable to provide accurate biological classifications. Marc Ereshefsky argues that biologists should abandon the Linnaean system and adopt an alternative that is more in line with evolutionary theory. He traces the evolution of the Linnaean hierarchy from its introduction to (...) the present. He illustrates how the continued use of this system hampers our ability to classify the organic world, and then goes on to make specific recommendations for a post-Linnaean method of classification. Accessible to a wide range of readers by providing introductory chapters to the philosophy of classification and the taxonomy of biology, the book will interest both scholars and students of biology and the philosophy of science. (shrink)

Traditionally, species have been treated as classes. In fact they may be considered individuals. The logical term “individual” has been confused with a biological synonym for “organism.” If species are individuals, then: 1) their names are proper, 2) there cannot be instances of them, 3) they do not have defining properties, 4) their constituent organisms are parts, not members. “ Species " may be defined as the most extensive units in the natural economy such that reproductive competition occurs among their (...) parts. Species are to evolutionary theory as firms are to economic theory: this analogy resolves many issues, such as the problems of “reality” and the ontological status of nomenclatorial types. (shrink)

If species are the things that evolve at least in large part through the action of natural selection, then both genetic and phenotypic variability are essential to biological species. If all species are variable, then Homo sapiens must be variable. Hence, it is very unlikely that the human species as a biological species can be characterized by a set of invariable traits. It might be the case that at this moment in evolutionary history, all human beings happen to possess a (...) particular set of traits, but if so, this will be in large part an evolutionary accident. As a result, anyone who proposes to base anything, including ethics, on human nature is basing it on historical happenstance. (shrink)