This article is a summary of the conclusions of a work in progress on “Biology and Cognition;” from this stems the rather general character of the following observations. In order to compare cognitive and biological mechanisms, we must first state that the former are an extension and utilization of organic auto-regulations, of which they are a form of end-product. To demonstrate this, one can begin by noting the close parallels between the major problems faced by biologists and those faced by theoreticians of the intelligence or of cognition. Secondly, one can analyze the functional analogies and especially the structural isomorphisms between organic life and the means of cognition: “nested” structures, structures of order, multiplicative correspondence, etc. One can also attempt a sort of comparative epistemology of the different levels of behavior (the “logic” of the instincts or of the learning processes, etc.). Finally, one can examine the explanations current among biologists to account for the formation of intelligence. But if these various analyses bring into relief the continuity between organic life and cognitive mechanisms, on the other hand it still remains to be seen that the latter constitute differentiated and specialized organs for reacting physiologically to the external world. Or in other words, that at the same time that they are an elaboration of organic structures in general, they fulfill particular functions, although still of a biological nature. The following pages are based on this premise, but it should be understood that it is not a question of contrasting cognition with organic behavior but rather of placing the functions of the former within the framework of the latter.