280 



PHYSIOLOGY 



CHAP. 



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 osmic acid : 

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



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FIG. 92. Fragments of epithelium from frog's intestine, observed at different periods after 

 fat absorption. (Krehl.) 700 diameters. A, rana temporaria in summer, 3 hours after 

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

 feeding; C, rana esculenta in winter, 4th day after feeding with cream ; D, rana temporaria in 

 summer, 8 hours after feeding with olive oil. The fat droplets are stained more or less black 

 with osmic acid. 



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

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

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

 be the elementary granules that subserve the protoplasmic 

 function, surrounded by a layer of fat synthetically regenerated 



