RECAPITULATION 27 



nails, a bagpipe stomach, great subordination of 

 the cerebellum, a disc-like placenta, teeth dif- 

 ferentiated into incisors, canines, and molars, and 

 pectoral milk glands. 



Man is more closely akin to the anthropoid apes 

 than to the other primates on account of his 

 immense brain, his ape-like face, his vertical spine, 

 and in being a true two-handed biped. The man- 

 like apes and men have the same number and 

 kinds of teeth, the same limb bones and muscles, 

 like ribs and vertebrae, an atrophied tail, the same 

 brain structure, and a suspicious similarity in looks 

 and disposition. Men and anthropoids live about 

 the same number of years, both being toothless 

 and wrinkled in old age. The beard, too, in both 

 classes of animals appears at the same period of 

 life and obeys the same law of variation in colour. 

 Even the hairs on different parts of the bodies of 

 men and anthropoids, as on the arms, incline at a 

 like angle to the body surface. The hair on the 

 upper arm and that on the forearm, in both anthro- 

 poids and men, point in opposite directions 

 toward the elbow. This peculiarity is found no- 

 where in the animal kingdom excepting in a few 

 American monkeys. 



Man's mammalian affinities are shown in his 

 diaphragm, his hair, his four-chambered heart, his 

 corpus callosum, his non-nucleated blood-corpuscles, 

 and his awkward incubation. 



The fishes, frogs, reptiles, birds, and non-human 

 mammals are human in having two body cavities, 

 segmented internal skeletons, two pairs of limbs, 



