ee ee eee hee ee = EE oe ae ae 
eee reer ree eee ET 
E Siete ices a oe 
1894.] Physiology. 621 
at this problem for several years, have furnished results from which 
he draws the following conclusions: 
1. The formation of urea does not take place in the liver alone; all 
the tissues produce a certain quantity. 
. The liver, however, is the most active secreter of urea in the 
young animal. 
3. The production of urea seems to accompany the phenomena of 
nutrition which occur in the different tissues, and the phenomena of 
elaboration and of preparation of nutritive materials constantly 
poured into the blood by the liver. (Revue Sci., Mai, 1894). 
