586 



THE DUCTLESS GLANDS ENDOCEIN GLANDS 



organs (e.g., brain, and digestive system) no doubt hold a similar de- 

 pendence upon the secretions (hormones) of the ductless glands. More- 

 over, the ductless glands themselves seem to sustain interdependent 

 relationships among themselves and with the genital glands. 



FIG. 504. SECTION OF PINEAL BODY OF AN OLD SHEEP, SHOWING 'BRAIN SAND' 

 (ACERVULUS) IN THE PARENCHYMA. 



(For recent reviews of literature on the epiphysis cerebri see Kidd, 

 "The Pineal Body : a Keview," Ke. Neur. Psyc., Jan. and Feb., 1913 ; and 

 Jordan, "Besults of Kecent Studies of the Mammalian Epiphysis Cerebri," 

 Trans. Amer. Micr. Soc., 31, 4, 1912.) 



