1902.] NATURAL SCIENCES OF PHILADELPHIA. 349 



course of the albumose through the cells is uninfluenced by the cell 

 structure, except in a purely mechanical way. In traversing the 

 cell it behaves independently of the cytoplasmic structure. Albu- 

 mose may accumulate on the ccelomic side of the cell from sixteen 

 hours onward after feeding. Judging by the size of the granules 

 formed by precipitation with killing fluids, albumose may exist in 

 the cell in as great as a 10 per cent, solution. Albumose has not 

 been found in the coelomic fluid. It is probable that the intra- 

 cellular ferment is concerned in the change of food from the 

 albumose stage to a later stage of the hydrolisis (peptone) or to a 

 stage in the inverse process toward albumen. 



12. The cells of the typhlosole absorb soluble foods. The 

 primary purpose of the structure, however, is to provide channels 

 through which the secretion of the hepal opaucreas may flow, un- 

 obstructed by solid food, to the median portion of the intestine. 



13. Dextrose is found in the intestines of animals which have 

 been starved, fed on potato starch, then killed in twenty-four hours 

 from the time of feeding. 



14. Microscopical study of the absorption of fats indicates : (a) 

 That this class of foods is hydrolized by the digestive secretion of 

 the heatopancreas ; (b) that they are absorbed in the form of cleav- 

 age products, and (c) are at least partially s}Tithesized into neutral 

 fats under the influence of fei'ment action inside the cell; (d) they 

 leave the cell not as discrete fat particles, but probably in the form 

 of cleavage products; (e) they appear in the blood coagulum and in 

 the blood corpuscles as neutral fats, reducing osmic acid and not 

 staining with acid-fuchsiue. 



15. The hepatopaucreas contains but one kind of secreting cells. 

 In a young stage these cells contain zymogen granules in nascent 

 condition, densely massed about the nuclei ; as the cells mature the 

 zymogen granules take up from the cytoplasm fatty substance, 

 wdiereby they become larger, looser in structure, more soluble in 

 many fixing fluids and more receptive of certain stains. The fer- 

 ment thus matured is set free into the lumen by (a) fragmentation 

 of the cell, (6) dissolution of the cell, (e) evacuation from the 

 cell. 



16. The secretion of the hepatopaucreas thus elaborated con- 

 tains ferments which act on the three classes of foods — proteids, 

 carbohydrates and fats. 



