left to owe their existence to the laws of procreation, by a process which we can not understand, but of which we have proof in the birth of every child that has been born of woman. KOSMICOS. We now have the two hypotheses of the origin and nature of the human mind fairly before us; and here I must point out to you wherein you do injustice to my side of the question. In the first place, your assumption of one pair of progenitors of the human race from whom have diverged all the varieties of the race, does not encounter the evolution process of man's descent as an animal. It is either an arbitrary assumption, or it is derived from the Mosaic account of the creation, which, in a scientific point of view, and aside from the supposed authority of that story, is just as arbitrary an assumption as if the book of Genesis had never existed. Take, therefore, Darwin's hypothesis of the zoölogical series: First, a fish-like animal, of course inhabiting the water; next, the amphibians, capable of living in the water and on the land; next, the ancient marsupials; next, the quadrumana and all the higher mammals, among whom are to be classed the _Simiadæ_ or monkeys; and out of these came the hairy, tailed quadruped, arboreal in its habits, from which man is descended. This long line of descent is filled with diversified forms, intermediate between the several principal forms which are known to us, and which were successively the progenitors of man. Now, hear Darwin on the subject of one pair of progenitors: