At this point it should be noted that the stem-cell does not contain any skeleton, model nor other preformed outline of the coming embryo for the following reasons: (1) neither the ovum nor the spermatozoön contains any such skeleton, model nor outline; and if each of them contain such a thing, both would be destroyed when these primary cells fuse and merge into the germ-cell. (2) The germ-cell first divides into two, four, eight, sixteen, thirty-two, and sixty-four daughter-cells, and so on into the millions; and this segmentation of the stem-cell and daughter-cells would surely annihilate any skeleton, model or other outline that might exist in the germ-cell; (3) the germ-cell first divides into two daughter-cells and so on, to infinity, as already stated; and these daughter-cells form what are called “germ-layers” or sheets of cells from which the human body and all of its organs and parts are built up. (Haeckel, Ev. Man, pp. 14, 16, 59, 92; Encyc. Brit., (9th ed.) 3, p. 682; 8, pp. 165, 744; 24, p. 631; Cent. Dic. 3, p. 2500, “Germ-layer.”) This mode of growth, by the segmentation of cells and formation of germ-layers, is called “epigenesis” which Huxley defines as “the successive differentiation of a relatively homogeneous rudiment, into the parts and structures, which characterize the adult.” (Encyc. Brit. 8, p. 744. Cent. Dic. 3, p. 1968, “Epigenesis.”) According to the theory of _epigenesis_, which is now held by all the scientific world, the human body grows anew from the germ-cell, without any skeleton model or any other kind of preformation. “Every living thing,” says Huxley, “is evolved from a particle of matter, in which no trace of the distinctive characters of the adult form of that living thing is discernible. This particle is termed a _germ_.” (Encyc. Brit. (9 ed.) 8, p. 746.) He defines a germ as “matter potentially alive, and having, within itself, the tendency to assume a definite living form;” and says that this definition “appears to meet all the requirements of modern science.” (Encyc. Brit. (9 ed.) 8, p. 746.) “In all cases,” he says, “the process of evolution [growth] consists in a succession of changes of the form, structure and functions of the germ [fertilized ovum], by which it passes, step by step, from an extreme simplicity, or relative homogeneity, of visible structure to a greater or less degree of complexity or heterogeneity; and the course of progressive differentiation is usually accompanied by growth, which is effected by intussusception.” (Encyc. Brit. 8, p. 746.)