“All the sentiments of the human mind, gratitude, resentment, love, friendship, approbation, blame, pity, emulation, envy, have a plain reference to the state and situation of man, and are calculated for preserving the existence and promoting the activity of such a being in such circumstances.” Hume, Dialogues Concerning Natural Religion (1779), part 3, Section 13 / It is quite common for philosophers, if not biologists, assessing the impact of Darwin on our views about human nature to associate him with Hume. Owen Flanagan even talks of a 'Humean-Darwinian' picture of human nature. In this chapter I want to chart the relation in some detail. The result is not to disrupt the marriage but to suggest, with more precision than usual, how close and how fertile it actually is. / Human Nature / By 'human nature' we generally denote not our bare animal construction - two eyes, four limbs, one head, upright gait and so on - but our rather more exciting psychological traits. Theorists of human nature are particularly concerned with our cognitive and motivational dispositions and capacities, the subjects of Hume's Treatise of Human Nature (1739).