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Do mereological fusions have their parts essentially? None of the axioms of non-modal formulations of classical mereology appear to speak directly to this question, and yet a great many philosophers who take the part-whole relation to be governed by these axioms seem to assume they do. Curiously, dissenters tend to depart from non-modal formulations of classical mereology at least when it comes to the uniqueness of composition: no two mereological fusions ever fuse exactly the same objects. I would like to argue that this is more than a remarkable coincidence; there are reasons of principle why one’s adherence to classical mereology should exert some pull towards the hypothesis that fusions have their parts essentially. There is, however, no direct route from non-modal classical mereology to the hypothesis that fusions have their parts essentially, and the reason for this is not merely the expressive limitations of the language of classical mereology; there is no direct route from the combination of classical mereology and propositional modal logic to the hypothesis that fusions have their parts essentially.

Mereology is the logic of part—whole concepts as they are used in many different contexts. The old chemical metaphysics of atoms and molecules seems to fit classical mereology very well. However, when functional attributes are added to part specifications and quantum mechanical considerations are also added, the rules of classical mereology are breached in chemical discourses. A set theoretical alternative mereology is also found wanting. Molecular orbital theory requires a metaphysics of affordances that also stands outside classical mereology.

Mereology is the logic of part—whole concepts as they are used in many different contexts. The old chemical metaphysics of atoms and molecules seems to fit classical mereology very well. However, when functional attributes are added to part specifications and quantum mechanical considerations are also added, the rules of classical mereology are breached in chemical discourses. A set theoretical alternative mereology is also found wanting. Molecular orbital theory requires a metaphysics of affordances that also stands outside classical mereology.

SURVEYS (a) David Lewis, Parts of Classes (Blackwell, Oxford, 1991), §§3.4–3.6 (pp. 72–87) (b) Achille Varzi, ‘Mereology’, Stanford Encyclopedia of Philosophy, http:// plato.stanford.edu/entries/mereology/. (c) Michael C. Rea (ed.), Material Constitu- tion (Rowman & Littlefield, Lanham, MD, 1997), esp. the introduction. (d) van Cleve and Markosian, ‘Mereology’, Theodore Sider, John Hawthorne, and Dean W. Zimmerman (eds.), Contemporary Debates in Metaphysics (Blackwell, Oxford, 2007), ch. 8, pp. 319–63. (e) Peter M. Simons, Parts: A Study in Ontology (Oxford University Press, Oxford, 1987).

I offer a reconstruction of Brentano's view of inner consciousness and show how Brentano prevented a regress of higher-order mental acts.

0. Introduction: Mereology, Metaphysics, and Speculative Grammar 0.1 Mereology, Ancient and Contemporary 0.11 Mereology is, strictly speaking, the theory of ...

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