When the abstract conception of thought is set aside, and it is agreed that thought must be treated as a process among the processes of experience, there is still room for divergence of opinion as to the exact manner in which thought is related to other functions. Dewey's logical theory, as outlined above, depends upon a very special interpretation of the place which thought occupies in experience. For this reason he considers logic to be inseparable from psychology. "Psychology ... is indispensable to logical evaluation, the moment we treat logical theory as an account of thinking as a mode of adaptation to its own generating conditions, and judge its validity by reference to its efficiency in meeting its problems."[185] Psychology, in other words, must substantiate Dewey's account of thought, else his 'logic' has no foundation. But if it were held that the cognitive processes cannot be separated (except by abstraction for psychological purposes) from other processes, there could manifestly be no such logical problem as Dewey has posited. Logic would be freed from reliance upon psychology. In this case, logical inquiry would be directed to the study of concepts, forms of judgment, and methods of knowledge, with the purpose of determining their relations, proper applications, and spheres of relevance. Logic would be a 'criticism of categories' rather than a criticism of the function of thinking. Dewey recognizes that such a study of method might be useful, but holds that it would be subsidiary to the larger problems of logic. "The distinctions and classifications that have been accumulated in 'formal' logic are relevant data; but they demand interpretation from the standpoint of use as organs of adjustment to material antecedents and stimuli."[186] It will be seen that the treatment of the forms of thought as "organs of adjustment" makes logic subsidiary to psychology, necessarily and completely. All follows, however, from the original assumption that thought is a special activity, clearly distinguishable from other experienced processes, and possessing a special function of its own. In his further analysis of logical theory, Dewey states that it has two phases, one general and one specific. The general problem concerns the relations of the various functions of experience to one another; how they give rise to each other, and what is their order of succession. This wider logic is identified with philosophy in general.[187] The specific phase of logic, logic proper, concerns itself with the function of knowing as such, inquiring into its typical behavior, occasion of operation, divisions of labor, content, and successful employment. Dewey indicates the danger of identifying logic with either of these to the exclusion of the other, or of supposing that they can be finally isolated from one another. "It is necessary to work back and forth between the larger and the narrower fields."[188]