METABOLISM 



591 



FIG. 181. RAT CAGE FOR STOCK ANIMALS. As. USED BY OSBORNE AND MENDEL. 

 (Ferry: Journal of Laboratory and Clinical Medicine, 5, 735, 1920.) 



FIG. 182. BREEDING CAGE. As USED BY OSBORNE AND MENDEL. 

 (Ferry: Journal of Laboratory and Clinical Medicine, 5, 735, 1920.) 



