The greatest diversity of butterflies and their host plants occurs in tropical regions. Some groups of butterflies in the tropics exhibit monophagous feeding in the larval stage, exploiting only one family of plants; others are polyphagous, feeding on plants in two or more distinct families. The two major types of tropical habitats for butterflies, namely primary and secondary forests, offer very different evolutionary opportunities for the exploitation of plants as larval food. Butterflies are faced with the major logistical problem, as (...) are many other herbivorous insects, of depositing eggs on the correct plant for successful larval feeding. This paper, using the concepts of phenotype set and spatial patchiness of resources, attemps to make some predictions as to the optimal phenotypic systems for monophagous and polyphagous feeding in tropical butterflies, as related to the spatial patchiness of larval host plants in primary and secondary forests. In addition to the secondary compound chemistry of larval host plants as playing a role in the evolution of monophagy and polyphagy, the assumption is made that the spatial patchiness of host plants within and among different families also acts as a major factor in determining optimal ranges of phenotypes for different patterns of larval feeding. Owing to the high spatial patchiness of primary forest species of canopy trees and vines, it is predicted that butterflies exploiting these will be mostly polyphagous, whereas secondary forests having stable formations of fewer plant species and larger patches of these plants, will have mostly monophagous species. Forest understories may have both monophagous and polyphagous species, depending upon the layer of forest and the general type of understory (i.e. palmaceous or dicotyledonous). Field data on some groups of butterflies from tropical America support these predictions. Polyphagous butterflies are predicted to possess a genetic system of mixed morphs with a population being polymorphic as a whole; monophagous butterflies are predicted to have individuals all more or less similar genetically, and with a high amount of genic variation within individuals. Other forms of monophagy may evolve in species that are essentially monomorphic but with various mechanisms (physiological, developmental, behavioral) of phenotypic flexibility at the individual level. Although the environment is essentially coarse-grained for larvae since most are sedentary and polymorphism is an optimal adaptive strategy, the oviposition strategy of the adult must also be considered and some situations (i.e. forest canopy) have resources (host plants) distributed in a fine-grained fashion. Other forms of limited polyphagy may result from monomorphic genetic systems in which there is considerable phenotypic flexibility. (shrink)

Drawing heavily upon natural history data from the Neotropical butterfly fauna, an attempt is made to develop a model, with testable hypotheses, to account for the evolution of egg-clustering and larval gregariousness. Given the high diversity of both plant and butterfly species in the American tropics, there is a higher incidence of egg-clustering there, including some species with aposematically-colored immature stages. Emphasis is placed on the need to examine both the physical (mechanical) toughness of larval food plants for larval feeding (...) success, and the spatial structuring of food plant populations. It is argued that when food plant spatial patchiness is high, the breadth of local food plant species usage low, plant growth rates high, fed-upon structures tough, butterfly dispersal low, and reproductive potential low, egg-clustering evolves. Such ecological character states, coupled with the occurrence of food plant patches in large sizes relative to the nutritional and fecundity needs of the butterfly specialist on the species, select for egg-clustering to ensure survival of the butterfly population in that habitat. It is emphasized that the model proposed here requires considerable examination through field studies. (shrink)

This article argues that much of the uproar about insider trading has focused its concerns on the wrong parties. Most of the attention has focused on the adverse effects of insider trading on traders, i.e., individuals who sold while insiders were buying or bought when insiders were selling. The parties that were more likely to be hurt by insider trading are the owners of the companies, i.e., the insiders' employers which for corporations will be the ongoing shareholders, as well as (...) society in general. Since the undesirable acts of employees can occur without transactions involving securities, any reforms may want to view the process of misusing proprietary information as embezzlement or theft. The holding of insiders to a high ethical standard will result in a more efficient operation of the capital markets. (shrink)

This essay presents a heterodox reading of the issue of solipsism in Wittgenstein’s Tractatus Logico-Philosophicus, out of which the whole of the TLP can be re-read. Inspired by, though not dependent on, the themes of virtuality and singularity found in Deleuze’s ‘transcendental empiricism’, Wittgenstein’s concept of ‘logical space’ is here complexly related to the paradoxes of the ‘metaphysical subject’ and ‘solipsism,’ within which the strictures of sense are defined, and through which the logico-pictorial scaffolding of the TLP precipitates its own (...) systematic dissolution. It shows how nonsense envelopes not only not idle chatter, and metaphysical confusion, but sense itself. (shrink)

This essay elaborates the nature and consequences of compression and noise, understood as interdependent phenomena determining current aesthetic regimes and modes of perception in the “cognitive co...

This article challenges the idea that the priority of liberty poses a threat to individual and population health. While acknowledging there are cases in which liberty does indeed pose a threat to the health of individuals and populations, I argue that the tension between liberty and health is overstated and that much can be done to relieve this tension. Indeed, liberty and health can and should be viewed as co-equal values in our broader conception of health justice. My thesis is (...) moderate to the extent it acknowledges limits to the coequal status of these twin values; robust to the extent it conceives legitimate health interventions as the outcome of complex and multiperspectival processes of deliberative testing. (shrink)

A re-publication of the whole of the work of Marsilio Ficino, being an impossibility, Kristeller1has presented students with a monumentalSupplementum Ficinianum, in which he brings together everything that was not included in the Basle edition, which he takes for his basis, everything, that is to say, that he has been able to trace in the course of a very thorough search made in numerous Italian and foreign libraries. In a learned introduction there are prefixed to the edition three indexes, of (...) the codices, editions, and works of Ficino, and with each work is given a concise account of its origin, purpose, and fortune in the world. There follows the collection of Ficino's writings, some unpublished, and some having already been published sporadically, but omitted from the Basle edition. The final items are two indexes of proper names quoted in the Basle edition and in theSupplementumrespectively. (shrink)

BenedettoCroce'sbook on history1is the ideal continuation of his earlier book published over a score of years ago on “La Teoria e Storia della storiografia” forming the final part of the “Filosofia dello spirito.” During this long period Croce has had the opportunity to enrich and extend his historiographical experiences with a series of volumes, of which those on the History of Naples, the History of Italy, and the History of Europe in the Nineteenth Century are the most important and have (...) had the widest repercussions. In all this range of experience his fundamental theses on the character and value of history have not been substantially altered. They have actually developed in breadth and depth, so that in the present volume we find them with their characteristic lineaments, old and new together, rendered fuller and more vivid by the rich lymph of the concrete problems of historical life by which they are nourished. In the meantime a series of violent and tumultuous changes, provoking vehement opposing mental reactions, has brought into discussion grave doubts, raised on certain points which first appeared firmly established in the historical view of the world. The antithesis has moved Croce to reaffirm his thought with renewed polemic ardour, thereby throwing it into stronger relief, and giving it a greater sense of reality. (shrink)

Individuals often describe objects in their world in terms of perceptual dimensions that span a variety of modalities; the visual (e.g., brightness: dark–bright), the auditory (e.g., loudness: quiet–loud), the gustatory (e.g., taste: sour–sweet), the tactile (e.g., hardness: soft vs. hard) and the kinaesthetic (e.g., speed: slow–fast). We ask whether individuals use perceptual dimensions to differentiate emotions from one another. Participants in two studies (one where respondents reported on abstract emotion concepts and a second where they reported on specific emotion episodes) (...) rated the extent to which features anchoring 29 perceptual dimensions (e.g., temperature, texture and taste) are associated with 8 emotions (anger, fear, sadness, guilt, contentment, gratitude, pride and excitement). Results revealed that in both studies perceptual dimensions differentiate positive from negative emotions and high arousal from low arousal emotions. They also differentiate among emotions that are similar in arousal and valence (e.g., high arousal negative emotions such as anger and fear). Specific features that anchor particular perceptual dimensions (e.g., hot vs. cold) are also differentially associated with emotions. (shrink)

Traditional forms of farming, herding, and fishing are remarkably adapted to African conditions but these traditional approaches are being overtaken by modern pressures, particularly population growth. According to a report published by the Office of Technology Assessment (OTA), a nonpartisan analytical support agency of the U. S. Congress, one promising way to help African farmers and herders would be for development assistance organizations to focus more attention on the various forms of low-resource agriculture that predominate in Africa.In keeping with OTA's (...) mission and primary audience, “Enhancing Agriculture in Africa: A Role for U. S. Development Assistance” (1988) is a policy-oriented synthesis of available technical information. The report provides Congress with a range of options that, if pursued, could help Africans enhance agriculture, increase their food security, and improve their lives.This paper is drawn from the larger OTA report, and it focuses on the role technology might play in enhancing low-resource agriculture. Readers should see the full assessment (OTA, 1988) for more information on policy considerations; the specific technologies mentioned; or a complete list of advisory panel members, workshops and participants, and commissioned papers.OTA's report comes at a critical time: for a variety of reasons—ranging from changing values to increased budget constraints—U. S. foreign assistance policy is undergoing a fundamental reevaluation. This review of the potential of low-resource agriculture, and options the United States might pursue to enhance this approach, was intended to aid in this reevaluation. (shrink)

The fifty-seven original essays in this book provide a comprehensive overview of the interdisciplinary field of animal cognition.

In the conclusion to this multi-part article I first review the discussions carried out around the six essential questions in psychiatric diagnosis – the position taken by Allen Frances on each question, the commentaries on the respective question along with Frances’ responses to the commentaries, and my own view of the multiple discussions. In this review I emphasize that the core question is the first – what is the nature of psychiatric illness – and that in some manner all (...) further questions follow from the first. Following this review I attempt to move the discussion forward, addressing the first question from the perspectives of natural kind analysis and complexity analysis. This reflection leads toward a view of psychiatric disorders – and future nosologies – as far more complex and uncertain than we have imagined. (shrink)

Today humanity faces radical global climate change, mass species extinctions, and unprecedented transformations to both terrestrial and aquatic ecosystems across the globe. Environmental ethics is an academic subfield of philosophy concerned with normative and evaluative propositions about the world of nature and, perhaps more generally, the moral fabric of relations between human beings and the world we occupy. This Handbook contains 45 newly commissioned essays written by leading experts and emerging voices and represent some of the best and most contemporary (...) thinking in environmental ethics. The chapters range over a broad variety of issues, concepts, and perspectives that are both central to and characteristic of the field, thus providing an authoritative but accessible account of the history, analysis, and prospect of ideas that are essential to contemporary environmental ethics. (shrink)

Medical science brings innovations in patient care at an astounding pace today - new chemotherapeutic agents, coated stents, and minimally invasive surgery are just few recent examples. For physicians, though, the specter of malpractice liability can overshadow the marvel of practicing in this era. Many physicians are working in a volatile liability environment; they face spiraling costs for malpractice insurance, have difficulties purchasing liability coverage at any price, and see record payouts in a growing number of claims against their colleagues. (...) The American Medical Association has declared that at least 20 states are currently in a malpractice “crisis,” with another 24 states showing early signs of an impending crisis.There have been two comparable periods of instability in the last thirty years, but these predecessor crises differ from the current one in important ways. First, while physicians mainly experienced dwindling options for obtaining coverage in the mid-1970s and exorbitant prices in the mid-1980s, the current crisis appears to have elements of both availability and affordability. (shrink)

Medical science brings innovations in patient care at an astounding pace today - new chemotherapeutic agents, coated stents, and minimally invasive surgery are just few recent examples. For physicians, though, the specter of malpractice liability can overshadow the marvel of practicing in this era. Many physicians are working in a volatile liability environment; they face spiraling costs for malpractice insurance, have difficulties purchasing liability coverage at any price, and see record payouts in a growing number of claims against their colleagues. (...) The American Medical Association has declared that at least 20 states are currently in a malpractice “crisis,” with another 24 states showing early signs of an impending crisis.There have been two comparable periods of instability in the last thirty years, but these predecessor crises differ from the current one in important ways. First, while physicians mainly experienced dwindling options for obtaining coverage in the mid-1970s and exorbitant prices in the mid-1980s, the current crisis appears to have elements of both availability and affordability. (shrink)

This volume addresses a wide variety of moral concerns regarding slavery as an institutionalized social practice. By considering the slave's critical appropriation of the natural rights doctrine, the ambiguous implications of various notions of consent and liberty are examined. The authors assume that, although slavery is undoubtedly an evil social practice, its moral assessment stands in need of a more nuanced treatment. They address the question of what is wrong with slavery by critically examining, and in some cases endorsing, certain (...) principles derived from communitarianism, paternalism, utilitarianism, and jurisprudence. (shrink)