To linger in imagination over this moment of evolution is to linger over a transition from the dumb fluidity of animal consciousness to its articulation by the use of language. Sheer animal consciousness may alight, perhaps, upon any imaginable concept. Its rational defect is its inability to return after departure to the same spot. Who by taking pains could return again to precisely the number 91 but for the articulating, identifying, stabilising symbol? The rational use of the native intelligence thus hangs upon an ability to identify particles of consciousness arbitrarily shaped, to quit them, and then to return. And speech serves this end; so far as it is carried it precipitates fluid consciousness into stable, negotiable blocks for the architectural structures of thought. Now it is true that what is original, what is new, what is invented or discovered by the thinking mind itself emerges, not in the articulate particles--they are perforce old stuff--but in the perception by the intelligence of relations between them. This spontaneous perception of relationships is the play of reason; thought is a sort of creative miracle. On the other hand--and this is the point I am driving at--just because thought is the perception of relationships between particles of old stuff, the particles themselves condition these perceptions. I see only such relationships as hold between the particles I happen to possess; certainly I can see none between such as I do not possess. And those I have are none of my own creation. They are handed down to me. In this sense the power of thought the “faculty” of reason, is a _tradition_. In fancy I may picture a Romulus--abandoned on a hillside and suckled by a wolf--inventing for himself a system of symbols with which to articulate his own fluid consciousness, conning them into spontaneity, and building them into thought. But in reality he would not--he could not. The actual articulations with which one thinks are not native to the consciousness. Who of us can count more than a stray one or two of his own invention, even with the hint and model of a whole armory of them already in possession? They are, on the contrary, a heritage. And what one can think is conditioned by that heritage--such items of it as through hap or care one has previously acquired. All that I, for instance, can think in the field of chemistry is sharply limited to what I can construe with the articulate particles in that area of my consciousness. In my actual experience that area has been poorly endowed. All that I can think there I could say in a bad quarter of an hour. And what I can think there is cabined and cribbed by the special particles I happen to possess.