INTELLIGENCE, POWER, 



than the thyroid gland. In the fetus of the thoroughbred, 

 however, the thyroid gland is larger than the adrenal 

 glands, as we have found in an examination of thirty-four 



Vagus _JLJ ._ 



Greater splanchnic 



Lesser splanchnic 



-4. Aorta 



Greater splanchnic 



Thoracic chain 



^ 'Coe/iac gang/ia 



'Adrenal ganglion 



Adrenal gland 



Superior mesenteric 

 ganglion 



Inferior mesenteric _ 

 gang/ion 



^* Aortic plexus 

 -Abdominal chain 



FIG. 31. The sympathetic nervous system of the primate (chimpanzee). 



thoroughbred fetuses and fifty-three newborn foals. Thus 

 the fetus of the thoroughbred betrays its thyroidized 

 ancestor, the Arabian horse, as we may venture to assume 

 the fetus of man betrays its adrenalized ancestor, the ape. 

 The long period of adolescence of civilized man and the 

 long period of training and education that he requires is 

 correlated with a larger brain, a larger thyroid gland, and 

 smaller adrenal glands, as may be seen in the following 

 comparison of the energy formula of an Australian aborigine 

 and a chimpanzee, taken by us in the wild. 



200 



