ABSTRACT
Every thought involves a whole system of thoughts; and ceases to exist if severed from its various correlatives. Philosophy requires for its datum some substantive proposition. If Philosophy is completely-unified knowledge—if the unification of knowledge is to be effected only by showing that some ultimate proposition includes and consolidates all the results of experience; then, clearly, this ultimate proposition which has to be proved congruous with all others, must express a piece of knowledge, and not the validity of an act of knowing. The components of the vivid series are bound together by ties of co-existence as well as by ties of succession; and the components of the faint series are similarly bound together. Between the degrees of union in the two cases there are, however, marked and very significant differences. While the components of each present cohere with one another, they do not cohere at all strongly with those of the other present.
