It would certainly appear from all this, that by "Evolution" we are to understand some sort of entity at the back of the world, with power at its disposal capable of effecting all its operations,--something in fact remarkably like the First Cause of which we are in search,--and that by its "Laws" are signified some definite forces, the practical action of which has been ascertained by us, so that we can foretell the course of events under them, as we can that of the planets or the tides under the influence of gravitation. But is it scientific, or even intelligible, to use words thus, and to assign any such significance to such terms as "Law of Evolution," "Law of Substance," or any other "Law of Nature"? We are repeatedly warned to the contrary by so high an authority as Professor Huxley. Once, for instance, he discovered in a sermon of Canon Liddon's this "fallacious employment of the name of a scientific conception," for which it was however added, the preacher "could find only too many scientific precedents."[25] This fallacious use of terms, which nowise differs from that under consideration, Professor Huxley thus denounces: It is the use of the word "law" as if it denoted a thing--as if a "law of nature," as science understands it, were a being endowed with certain powers, in virtue of which the phenomena expressed by that law are brought about.... All I wish to remark is that such a conception of the nature of "laws" has nothing to do with modern science.... A law of nature, in the scientific sense, is the product of a mental operation upon the facts of nature which come under our observation, and has no more existence outside the mind than colour has. The law of gravitation is a statement of the manner in which experience shows that bodies, which are free to move, do, in fact, move towards one another.... The tenacity of the wonderful fallacy that the laws of nature are agents, instead of being, as they really are, a mere record of experience, upon which we base our interpretations of that which does happen, and our anticipation of that which will happen, is an interesting psychological fact: and would be unintelligible if the tendency of the human mind towards realism were less strong. A law, accordingly, "is not a cause but a fact,"[26] and we must learn laws from facts, not facts from laws. It is indeed evident on a moment's thought, that to speak of the Law of Evolution as causing things to be evolved, is like saying that the law of growth makes things grow. Till we know what happens, there is nothing of which Science can take account. True scientific teaching, I cannot too often repeat [says Professor Tait][27] requires that the facts, and their _necessary_ consequences alone, should be stated, as simply as possible.