CHEMICAL DYNAMICS OF ANIMAL NUTRITION 143 



PART IV 



This question has already been referred to in the introduction. 



The latest experiments on the subject, viz., those of Glaessnen 

 conducted in Hofmeister's laboratory, were carried out in the 

 following manner : The mucous membrane of the stomach was 



o 



stripped off and divided into two symmetrical halves. The one half 

 was coagulated, and the amount of peptones and albumoses determined 

 in the filtrate of the coagulum by the method of Pick. The other 

 half was incubated in a moist chamber at 40 for three hours, and then 

 coagulated, and the albumoses and peptones determined in the same 

 way as in the unincubated half. Glaessner showed that there was a 

 diminution of these bodies which reached a maximum when the animal 

 was killed five hours after a meal. 



The method employed in this research was similar ; instead 

 however, of using Pick's method, the coagulable albumen was deter- 

 mined directly by the procedure described in Part II. 



Results : 



Dog A. Killed four hours after a heavy meat meal. 



Non-incubated half. Total N. 103-0 N - R 94-0 Ratio r^- x 100 91*2 

 Incubated half. 105*0 92-2 877 



Dog B. Killed five hours after a meal. 



jg- ij 



Non-incubated half. Total N. 108*5 N - R 96-8 Ratio -^ x 100 91-2 



Incubated half. H3'o ,, 1007 89*1 



The residual nitrogen was also determined in a fasting dog and 

 found to be higher than in digesting dogs, i.e. as 23 : 97 (total N). 



The changes taking place in a tissue during secretory activity are 

 now forming the subject of another research. It is hoped to deaj 

 with these in a subsequent paper. 



The above experiments give no evidence of a synthesis of 

 albumens. 



