It still remained to consider a possible position; that of the man who distinguishes between the formal and the material element in consciousness, and identifies self or mind with the former. The formal element of consciousness is not a part of consciousness as the word part is commonly used, nor is it the whole of consciousness, in the ordinary acceptation of the word whole. And though this view might very well have been brought under a former head by stretching a little the meaning of the word part, yet such is its importance that I chose rather to omit it when discussing self as a part of consciousness (there using the word part in a limited sense), and to take it up later by itself. It was insisted that if the formal element in consciousness is enough of a thing to be distinguished from something else, and to be discussed, it is enough of a thing to admit of distinctions and differences much as other things do. After examination it appeared, as a matter of fact, that there is no reason why the believer in "form" should not attribute to it all of the seven kinds of sameness before described--even (in the modified way described a moment ago) the sixth kind. And it also appeared that no new kind of sameness is discoverable in this field. With this closed the search for samenesses. It will be observed that we have passed in review the self and the not-self as immediately known, the self and the not-self as bundles of "real" qualities out of consciousness, and the self and the not-self as noumenon or substance. I know of no other field in which the search may be prosecuted, unless such be invented gratuitously by increasing the "layers" of being in a way no one seems inclined to increase them. And in view of the fact that the samenesses found in any "layer" below the first seem to be only repetitions of what we find in that one, we could have no reason to hope that any such needless increase in strata could add a single new kind of sameness to those described. SEC. 19. Now that we have obtained a list of the different kinds of sameness, we may pass our eye over it with a view to discovering what the various kinds have in common, and what is the reason that we express such diverse experiences by the use of the one word. Such an examination reveals the fact that the common notion which unites them is the idea of similarity. In some cases this notion lies more in the foreground than in others, but in all cases it is present, and forms the bond of union. I will run through the list and point this out, beginning, however, with the second kind, and reserving the first for discussion after the others. II. A mere mention of the second kind of sameness is, in this connection, sufficient. Two mental experiences are there avowedly called the same to mark similarity.