 Like The Principles of Psychology, Varieties is “A Study in Human Nature,” as its subtitle says. But at some five hundred pages it is only half the length of The Principles of Psychology, befitting its more restricted, if still large, scope. For James studies that part of human nature that is, or is related to, religious experience. His interest is not in religious institutions, ritual, or, even for the most part, religious ideas, but in “the feelings, acts, and experiences of individual men in their solitude, so far as they apprehend themselves to stand in relation to whatever they may consider the divine” (V 31).