Occurrence of Fat. 409 



of fat in the liver cells has no relation to the fatness of the animal. 

 Fat was found in the renal epithelium in only one of the fifteen 

 animals slaughtered, and this animal was comparatively thin. (I 

 examined the kidneys of two 1400-pound fat steers slaughtered by 

 Swift & Co. at Chicago. In both animals the cells of many cortical 

 renal tubules were full of fat droplets.) Fat may occur in the 

 renal epithelium under normal conditions, but it seems to have no 

 relation to the fatness of the animal. 



In two thin animals and in one very thin animal the adrenal gland 

 was found to contain a considerable amount of fat in the cortical 

 cells. The fattest animals had no fat in this situation. This intra- 

 epithelial fat also seems to be independent of the nutritive condition of 

 the individual. 



Bullard has found fat droplets inside many of the muscle fibers 

 of the three submaintenance steers. There was only a small amount 

 of connective tissue fat in these animals. The muscle tissue had 

 undergone a marked atrophy. This condition can hardly be inter- 

 preted otherwise than as a fatty degeneration or infiltration due to 

 starvation. The absence of fat in the excessively fat animals shows 

 that the muscle fiber of the adult is not used as a place for the storage 

 of fat. 



Kemp and Hall (19) examined the muscles of animals fattened 

 for slaughter. They never found fat inside a muscle fiber. Keinath 

 (18) however found fat inside the fibers of pectoral muscle in a 

 fattened ox. He examined only one animal. 



The occurrence of fat in the tissues of animals other than the ox. 



Fat is found in the glandular tissue and in the muscle fibers of 

 many animals. I have examined the livers of several cats and found 

 in each specimen a large amount of fat. The lachrymal gland is 

 always full of fat, and the kidney usually contains a considerable 

 amount. 



Aschoff (2), using Flemming's fixation as the fat stain, finds 

 fat in the new-born child in the kidney, liver, heart muscle, basal 

 epithelium of skin, mast cells, leucocytes, epithelium of intestines, 



