With such a philosophy of science, it is evident that all progress in the understanding of nature would cease, as it ceased after Aristotle. The attempt would again be abandoned to reduce gross and obvious cycles of change, such as generation, growth, and death, to minute latent cycles, so that natural history should offer a picturesque approach to universal physics. If for the magic power of types, invoked by Aristotle, we substituted with M. Bergson the magic power of the _elan vital_, that is, of evolution in general, we should be referring events not to finer, more familiar, more pervasive processes, but to one all-embracing process, unique and always incomplete. Our understanding would end in something far vaguer and looser than what our observation began with. Aristotle at least could refer particulars to their specific types, as medicine and social science are still glad enough to do, to help them in guessing and in making a learned show before the public. But if divination and eloquence--for science is out of the question--were to invoke nothing but a fluid tendency to grow, we should be left with a flat history of phenomena and no means of prediction or even classification. All knowledge would be reduced to gossip, infinitely diffuse, perhaps enlisting our dramatic feelings, but yielding no intellectual mastery of experience, no practical competence, and no moral lesson. The world would be a serial novel, to be continued for ever, and all men mere novel-readers. Nothing is more familiar to philosophers nowadays than that criticism of knowledge by which we are thrown back upon the appearances from which science starts, upon what is known to children and savages, whilst all that which long experience and reason may infer from those appearances is set down as so much hypothesis; and indeed it is through hypothesis that latent being, if such there be, comes before the mind at all. Now such criticism of knowledge might have been straightforward and ingenuous. It might have simply disclosed the fact, very salutary to meditate upon, that the whole frame of nature, with the minds that animate it, is disclosed to us by intelligence; that if we were not intelligent our sensations would exist for us without meaning anything, as they exist for idiots. The criticism of knowledge, however, has usually been taken maliciously, in the sense that it is the idiots only that are not deceived; for any interpretation of sensation is a mental figment, and while experience may have any extent it will it cannot possibly, they say, have expressive value; it cannot reveal anything going on beneath. Intelligence and science are accordingly declared to have no penetration, no power to disclose what is latent, for nothing latent exists; they can at best furnish symbols for past or future sensations and the order in which they arise; they can be seven-league boots for striding over the surface of sentience.