314 PROCEEDINGS OF THE ACADEMY OF {.^^J, 



of the auterior cells. lu the column of the table devoted to these 

 cells, wherever ' ' small granules in masses ' ' are mentioned, refer- 

 ence is made to the substance here spoken of. It will be observed 

 from this column also thai in all fixations, except those which 

 blacken the cell contents, the granules are yellowish or brownish 

 even after staining. With the osmic fixations they are always 

 black. After such fixations they take the stains used. The median 

 cells have not, up to sixteen hours after feeding, undergone visible 

 change. 



^IdGr'^ 



Sru-^/ 



* ■■ V!*t' - 



Afi^^jvS 



c/ 



Fig. 11. — Cells X 600 from anterior portion of "mid-gut" of Porcellio 

 scaber : A, 8 hours after feeding ; B, 18 hours after feeding, both fixed 

 in 1 per cent, platinic chloride 15 parts, 1 per cent, osmic acid 4 parts. 

 Alb. Gr., albumose granules ; Zym. Or., zymogen granules. 



In figs. 11, J. and B, are seen numerous other larger and deeper 

 staining granules scattered in the finely granular substance of which 

 we have just been speaking. In fig. A particularly they seem to be 

 quite definitely aggregated with reference to this substance. The 

 small granules come from the nucleus, and there can be no doubt 

 as to the origin of the large ones. Fig. B contains the same kind 

 of granules in the lumen of the intestine, mixed with the coagulum 

 which represents the secretion of the hepatopancreas. Since the 

 food is almost pure proteid, and we know from the researches of 

 Huet that the secretion of the ' ' liver ' ' is capable of changing 

 proteid to "peptone" (albumose), we may presume that some 

 product in this process may be found here. Fischer's researches 



