Soul, sensation, and thought: a separate chapter could be devoted to each of these items. But, beyond considerations of space, there is a rationale for broaching them together, for these three notions are in some sense correlated. It is on certain aspects of this correlation that I shall focus. The first part of this chapter concentrates on the soul, and its relationship to the two other terms. The second part specifically will be devoted to the relationship between thought and the senses. Since an important aspect of the latter question bears on epistemology, some overlap with J. Lesher's contribution to this volume (Chapter 11) is unavoidable. However, I have tried to draw attention to “physiological” rather than epistemological problems. As it turns out, this emphasis may not be too artificial because, as we shall see, there is a question as to whether the early Greek philosophers' interests in the relationship between thought and the senses was not primarily physiological rather than epistemological, in a sense of the term “physiological” that remains to be spelled out.