14 
THE DESCENT OF MAN. 
Part I. 
differs from woman in size, bodily strength, hairyness, 
&c., as well as in mind, in the same manner as do the 
two sexes of many mammals. It is, in short, scarcely 
possible to exaggerate the close correspondence in gene- 
ral structure, in the minute structure of the tissues, in 
chemical composition and in constitution, between man 
and the higher animals, especially the anthropomor- 
phous apes. 
Embryonic Development . — Man is developed from an 
ovule, about the 125th of an inch in diameter, which 
differs in no respect from the ovules of other animals. 
The embryo itself at a very early period can hardly be 
distinguished from that of other members of the verte- 
brate kingdom. At this period the arteries run in arch- 
like branches, as if to carry the blood to branchim 
which are not present in the higher vertebrata, though 
the slits on the sides of the neck still remain (/, g, fig. 1), 
marking their former position. At a somewhat later 
period, when the extremities are developed, “the feet of 
“ lizards and mammals,” as the illustrious Yon Baer 
remarks, “ the wings and feet of birds, no less than the 
“ hands and feet of man, all arise from the same funda- 
“ mental form.” It is, says Prof. Huxley, 10 “ quite in 
“ the later stages of development that the young human 
“ being presents marked differences from the young 
“ ape, while the latter departs as much from the dog 
“ in its developments, as the man does. Startling as 
this Inst assertion may appear to be, it is demonstrably 
“ true.” 
As some of my readers may never have seen a draw- 
ing of an embryo, I have given one of man and another 
of a dog, at about the same early stage of development, 
10 * Man’s Place in Nature,’ 1863, p. 67. 
