280 



PHYSIOLOGY 



C1IAI'. 



gradually increases (from mere dots to large spherules) in suc- 

 cessively longer intervals from the meal. In proportion as they 

 become longer the granules stain more deeply with osrnic acid : 

 the least are round particles slightly tinged with grey, the larger 



B 



/. . 



: !'".' "' * 



; 









I' 





 _f^. c 





Flfi. !'i Fragments of epithelium from frog's intestine, observed at different periods after 

 fat absorption. (Krehl.) 700 diameters. A, i-nnn ti-ntjioraria in summer, 3 hours after 

 artilicial feeding with olive oil ; B, rana temporaria in summer, 5 hours after same 

 feeding; C, mini esculenta in winter, 4th day after feeding with cream ; I>, mmi tfm I'^rni'm in 

 summer, S hours after feeding with olive oil. Tin- fat diupli'ts are stained more or less black 

 with osinic acid. 



are spherules of a distinct black colour (Fig. 92). According to 

 Altrnann's theory of the granular structure of protoplasm, the 

 punctiform particles, which hardly stain with the osrnic acid, would 

 be the elementary granules that subserve the protoplasmic 

 function, surrounded by a layer of fat synthetically regenerated 



