1902.] NATURAL SCIENCES OF nilLADELPHIA. 327 



reactions for dextrose were obtained in a number of cases. Inas- 

 much as an effort was being made at the time to locate the dextrose 

 in the cells, the other ordinary tests which require an alkali and 

 heat were of necessity excluded. However, the reaction was con- 

 trolled by trying intestines from animals known not to have eaten 

 starch; and no indication of dextrose was obtained. Intestines 

 were tested again fifty hours after feeding; and good indications 

 were obtained. 



Intestines like the above were tested also with iodine both twenty- 

 four and fifty hours after feeding. In several cases the median 

 arched cells gave a ' ' port-wine ' ' color at their free ends, indicative 

 of either dextrine or glycogen, with the presumption in favor of 

 glycogen. 



VIII. Absorption of Fats. 



In studying the absorption of fats the same feeding methods have 

 been followed as for the absorption of proteids. Animals were 

 isolated and starved from four to ten days, then fed with butter, 



Fig. 15.— Section involviug parts of two cells X 600 from anterior por- 

 tion, "mid-gut " of PorcelUo scaber, fed with butter, and fixed after 8 hrs. 

 in 1 per cent. Platmic chloride 15 pts., 1 per cent. Osmic acid 4 pts. All 

 black granules outside the nucleus are fat. F.gl, fat globule encased 

 by spherical film ; Mus., muscle, circular layer inside, longitudinal 

 fibres^outside ; Nuc, nucleus. 



beef suet or olive oil (the latter mixed with boiled potato, to enable 

 the annual to grasp the food with the maudibles), all of which gave 



