480 Ralph H. Major. 



served in the cat, dog and in man. The capsule of the thyroid gland 

 has been divided by some into an internal capsule which can be 

 stripped off only with some difficulty, and an external capsule which 

 strips off readily. The above description refers to the blood-supply 

 of this outer capsule. 



Fig. 1.— Corrosion specimen of arterial injection of cat's tliyroid, showing 

 numerous anastomoses. X 5. 



The manner in which the arteries approach the thyroid gland show 

 some variations in the cat, dog and man. In the dog the superior 

 thyroid artery gives off two main branches, one anterior branch and 

 a posterior branch. Each of these in turn give off four or five small,er 



