AND PERSONALITY 



heart, that the subject of the treatment may be described 

 as suffering an emotional crisis. 



A final proof that thyroxin governs the rate of oxidation 



Foramen 



Vagus to gills 



Vagus to intestines 



First spinal nerve 



/fa/77/70 spinal nerves 



Sympathetic ganglion 



Ventral aorta 

 Vagus gang/ ion 



- Brachial artery 



^ Intercommunication 

 Dorsal aorta 



Sympathetic chain 



FIG. 21. The sympathetic nervous system of the fish (barracuda). 



of the brain cells and the cells of the sympathetic system is 

 shown by the immediate effect of thyroidectomy in a case 

 of exophthalmic goiter. 



A second fact of fundamental significance is that sever- 

 ing the sympathetic nerve supply to the adrenal glands 

 completely cures exophthalmic goiter, the increased vas- 

 cularization of hyperplasia of the thyroid gland disap- 

 pears, and the exalted state of the brain, hence of the 

 metabolism, and the emotional state return to normal. 



There is a significant contrast between the innervation of 

 the thyroid gland and the innervation of the adrenal glands. 

 The thyroid innervation is so slight that it is not easy to 

 find. The innervation of the adrenal glands is abundant and 

 complicated according to the power and personality of the 

 animal. In the alligator the adrenal glands, the celiac 

 ganglia, and the sympathetic system are insignificant; in 

 the lion they are large, powerful, and formidable. 



Figures 19 to 33 illustrate the rise of the sympathetic 



191 



