The foregoing excursion into problems of nature was found to be necessary because of the character of the scientific enterprise. If science is the exploration of nature and the formulation of her content and structure in symbols, some examination of the realm of natural entities is a prerequisite to undertaking a logical analysis of scientific method and doctrine. Awareness has been shown to possess a peculiar relation to its content which permits us to say that it is of the content. There is probably very little that one can say which will elucidate further the character of this relation. The chapter shows that the nature of awareness and the extent to which it is under control. If awareness is under control, then knowledge, which is the awareness of a certain kind of content, is also under control. But although awareness is partially under control as to intensity, kind, and locus, there are distinct limitations to this control.