SECRETION. 407 



urine. It also increases the urinary nitrogen, probably due to pro- 

 teid changes. It acts best in the pale, fat person. 



Yon Cyon has made a full study of the relation of the thyroid 

 to the heart. He states that suppression of the activity of the thy- 

 roid or an injection of iodothyrin has an immense influence upon 



Fig- 147a- Convulsive Movements after Thyro-parathyroidectomy in 

 the Dog. (GLEY.) 



Beginning of convulsive movements about sixty hours after the operation. 

 M, Contractions of the shoulder muscles. R, Respiratory movements (Polyp- 

 nffia), an hour after a strong convulsive attack. The rectal temperature a half 

 hour after the attack was 41.35 C., and two hours after 43.1 C. 



the entire nervous system of the heart and blood-vessels. He proves 

 that the vagus participates in the innervation of the thyroid gland, 

 or is at least closely connected with it. The function of the thyroid 

 is to render harmless the salts of iodine, which have a toxic effect 

 upon the vagi and sympathetic nerves by converting them into an 

 organic compound, the iodothyrin. The latter compound has a 

 stimulating effect upon these same nerves and at the same time 



