Philosophy
About one hundred works on philosophy, several published in the sixteenth and seventeenth centuries, but most from the eighteenth and nineteenth, represent western thought throughout history. In addition to those listed below are writings by Condillac, Locke and Paley, as well as a small collection of volumes by Thomas Cogswell Upham.

Description of bookplate
Major holdings:
- Plato
- Divini Platonis Gemmae, 1556 and Opera, 1577
- Aristotle
- Organum, 1623, among others
- Thomas Aquinas
- Summa Theologica, 1496, 1588, 1626, and 1686; Opusculus Omnia ...,1587; and Catena Aurea, 1566
- Rene Descartes
- Principia Philosophiae, 1664
- Denis Diderot
- Encyclopédie, ou Dictionnaire Raisonné ..., 1777-79, in the Bowdoin Collection
- David Hume
- Essays and Treatises on Several Subjects ..., 1760
- Immanuel Kant
- Kritik der praktischen Vernunft, 1788; and Metaphysische Anfangsgrunde der Naturwissenschaft, 1800
- Thomas Cogswell Upham Collection:
- Fifty-four volumes by this Bowdoin College philosophy professor. Upham (1799-1872) taught at Bowdoin from 1824 to 1867 and is best known for A Philosophical and Practical Treatise on the Will, 1834. That work and another, Outlines of Imperfect and Disordered Mental Action, are early contributions to modern psychology.