FAT-ABSORBING FUNCTION OF ALIMENTARY TRACT OF KING SALMON. I 75 



Plate XV. 



Fig. II. — Showing fat absorption in the superficial epithelium of the free margin of a mucous fold of 

 the pyloric coecum of young salmon no. 46. This figure represents the maximal loading of fat. Many 

 of the cells are so gorged with fat that their surface outlines are projecting as though under a high internal 

 osmotic pressure. Camera lucida outlines. Magnification, Leitz ocular 2, objective 1/12. 



Fig. 12. — Showing fat absorption in a portion of two adjacent folds of pyloric cylindrical epithelium 

 from a normally feeding adult salmon from the fishing banks of Monterey Bay. The clear marginal zone 

 is well shown in this figure, also the characteristic finely divided liposomic fat immediately beneath it. 

 This zone shades off into one of larger droplets lying just external to the nuclear layer. Note the com- 

 paratively small amount of fat in the inner zone of the epithelium and in the thin layer of the tunica 

 propria. The fat droplets are most carefully laid in from camera lucida outlines. Salmon number 22. 

 Magnification, Leitz ocular i, objective 1/12. 



Fig. 13. — Showing fat absorption in a normally feeding adult salmon, no. 28, Monterey Bay, Cal. 

 This figure represents a later stage of absorption than the proceeding. It shows a loading of the inner 

 ends of the cells with finely divided liposomes and a similar charge of fat in the adjacent tunica propria. 

 The fat has passed the outer zone. This stage of fat absorption was rather rarely observed. Camera 

 lucida outlines. Magnification, Leitz ocular i, objective 1/12. 



