FEKMENTATION 253 



tively little of the sodium sulphate will have 

 left the intestine. Yet sodium sulphate is some- 

 what more diffusible than dextrose. 1 



Assimilable Proteids. With a catheter re- 

 move the urine from the bladder of an ansesthe- 

 tized female cat, and apply Heller's test for 

 albumin (page 248). Albumin should be absent. 

 Slowly inject into the jugular vein 25 c.c. of 

 solution of alkali-albumin (page 249) at the tem- 

 perature of the body. Test the urine for albumin 

 twice, at intervals of half an hour. 



No albumin will be found. The alkali-albumin 

 has not been removed from the blood by the 

 kidneys. 



Non- Assimilable Proteids. Perform a similar 

 experiment on another cat, injecting solution of 

 egg-albumin instead of alkali-albumin. 



Albumin will be found in the urine. Egg- 

 albumin, present in the blood, is at once re- 

 moved by the kidneys. It cannot be used unless 

 changed ("digested") in the intestine. 2 Albu- 

 moses and peptones are also non-assimilable; 

 they produce a dangerous fall in blood-pressure. 



1 Compare HOFFMANN: Eckhard's Beitrage zur Anatomie 

 und Physiologie, 1860, ii, p. 65. 



2 MUNK, J., and M. LEWANDOWSKY (Archiv fiir Physiologie, 

 1899, Supplement, pp. 73-88) find the non-assimilable proteids 

 of Neumeister (not including albumoses and peptones) may be 

 assimilated if injected very slowly into the blood. 



