In the first part of this article an attempt was made to clear the ground for a functional theory of knowledge, and the discussion of structure and function with which it concluded enables us to approach the problem of cognition. If the view already set forth is sound, it seems clear that the relation of the mind to its object is a function and not a structure of the mental processes involved. The mere existence of a mental content, however complex it may be, however decorated with fringes or set off by a background, does not constitute an act of knowledge or give the content a meaning. In order to see a mental act as cognitive we must consider its function, its origin, its results, and in general the circumstances in which it stands.