A MILKY WHITE AMPHIBIAN EGG JELL. 26 1 



Opaque egg jell. 0.2764 gram gave 18.3 c.c. o.i normal 

 NH 4 OH; 0.3540 gram gave 23.0 c.c. o.i normal NH 4 OH, indi- 

 cating 9.27 per cent, and 9.09 per cent, respect'vely or an average 

 of 9.18 per cent, of nitrogen in the opaque egg jell. 



Almost no chemical work has been done with the amphibian 

 egg jells aside from the observation that the nitrogen content is 

 low due to the presence of a carbohydrate nucleus. Of course 

 the above results do not give the true nitrogen content of the 

 egg jell for they should have been corrected for ash content, but 

 this was not possible due to lack of material. The figures do 

 show, however, that the jells differ chemically as well as in ap- 

 pearance, and that the difference in nitrogen content is in the 

 same direction and of almost precisely the same amount that it 

 would be if the opaque appearance were produced by an ad- 

 mixture of albumen (nitrogen = 15 per cent.-i6 per cent.) with 

 the normally occurring mucins. 



STATION FOR EXPERIMENTAL EVOLUTION, 

 August 17, 1914. 



