190 THE HISTORY OF CREATION. 
ege, this process of development always begins by the 
simple egg-cell (Fig. 3) forming’an accumulation of cells 
f 
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Fic. 4.—First commencement of the development of a mammal’s egg, the 
so-called “cleavage of the egg” (propagation of the egg-cell by repeated 
self-division). A. The egg, by the formation of the first furrow, falls into 
two cells. B. These separate by division into four cells. C. The latter 
have divided into eight cells. D. By repeated division a globular accumu- 
lation of numerous cells has arisen. 
(Fig. 4) by continued self-division. The outer covering, or 
cell membrane, of the globular egg remains undivided. First, 
the cell-kernel of the egg (the so-called germinal vesicle) 
divides itself into two kernels, then follows the cell-sub- 
stance (the yolk of the egg) (Fig. 4 A). In like manner, 
the two cells, by continued self-division, separate into four 
(Fig. 4 B), these into eight (Fig. 4 C), into sixteen, thirty- 
two, etc., and finally there is produced a globular mass of 
very numerous little cells (Fig. 4D). These now, by further 
increase and heterogeneous development (division of labour), 
gradually build up the compound many-celled organism. 
Every one of us, at the commencement of our individual 
development, has undergone the very same process as that 
represented in Fig. 4. The egg of amammal—represented in 
Fig. 3, and its development in Fig. 4—might as well be that 
of a man, as of an ape, dog, horse, or any other placental 
maminal. 
