Apparently, the Creator uses the germ-cell to inaugurate the growth of daughter-cells in the embryo body, in the same manner that a grain of wheat is used to start the growth of a stalk of wheat. Sec. 19. Reproduction, its Phenomena All the phenomena of reproduction may be grouped under the following heads: (1) Production of the spermatozoön, (2) production of the ovum, (3) their fusion into the fertilized ovum, (4) production of daughter-cells, (5) distribution, mechanical arrangement and grouping of cells, (6) differentiation of cells into the different tissues, (7) waste of cells. Sec. 20. Spermatozoön, its Production The first step toward the reproduction of a man, woman, or any other mammal, (an individual of a species which suckles its young), is the formation of a spermatozoön in the genital organs of a male. See index, infra, “Spermatozoön.” Sec. 21. Ovum, its Production The production of an ovum in the genital organs of a female is the second step. It is immaterial which of them is produced first. The essential point is that they shall meet and fuse into the fertilized ovum. See Sec. 14, supra; Index, infra, “ovum.” Sec. 22. Germ-Cell, its Production The third step is the fusion of the spermatozoön and ovum into the germ-cell, stem-cell or fertilized ovum. See index, infra, “germ-cell,” “stem-cell,” “fertilized ovum.” Sec. 23. Daughter-Cells, Their Production The fourth step is the production of daughter-cells. The germ-cell (fertilized ovum) is the primordial cell, from which every other cell in the human body is directly or indirectly, produced by fission or self-division. As already stated, the germ-cell divides into two daughter-cells, these into four, these into eight, sixteen, and so on to infinity. Every cell is composed of a vast number of atoms. A portion of these atoms is differentiated into “the inner nucleus (caryoplasm)” and “the body of the cell (cytoplasm).” (Haeckel, Ev. Man, p. 38.) Again he says: “In a mesh of the nuclear net-work … there is, as a rule, a dark, very opaque, solid body, called the nucleolus.” (Ev. Man, p. 38.) On another page, he says: “Some cells have a ‘nucleolinus’ in the center of the nucleolus.” (Ev. Man, p. 40, fig. 9.) We cannot believe that any microscopic cell in the human body has intellect, memory, will-power nor creative force. For a stronger reason, we cannot imagine that any of the atoms of which any cell is composed, has these faculties. Nor can we conceive that a portion of these atoms, automatically, metamorphose themselves into a nucleolus, others into a nucleolinus, while the remainder continue to be a simple cell-body. How do the cells know when the time has come to divide into two daughter-cells; where the dividing line should run in order to divide the cell-body, nucleus and nucleolus into two equal parts? For further discussion of cells see Index, infra, “cell.” Sec. 24. Animals, Their Sizes are Determined, How?