388 Dr. Prout’s experiments on the changes which take place 
oil was obtained in a separate state. On cooling, it became 
nearly solid, and weighed 91 grains. The albuminous prin- 
ciple above mentioned, weighed 55.3 grains. Hence this 
yelk consisted of 
Grains. 
Water . . 170.2 
* Albumen ? . 55.3 
Yellow Oil. . 91.0 
3 16 -5 
But I have reason to believe that the proportions of these 
ingredients differ a little in different eggs. 
Experiments on the egg at the end of the first week of incubation, 
or about the 8th day. 
At the end of the first week, it has been found, on an ave- 
rage, that on the supposition that the egg originally weighed 
1000 grains, it has now lost about 30 grains, and the weights 
of the constituent principles of two eggs in their moist state, 
were as follow : 
Unchanged albumen 
Modified albumen 
Liq. amnii, membranes, blood-vessels, &c 
Animal ..... 
Yelk 
Shell and loss .... 
* This proportion of the albuminous principle does not differ much from that 
stated to exist in the yelk of the common fowl, by Mr. Hatchett. Philos. Trans, 
vol. cvi. p. 308. 
No. 1. No. 2. 
Grains. 
Grains. 
232.8 
247.I 
179.8 
I 
97 -o 
22.0 
J 
3 01 -3 
3 3 4-5 
167.1 
153-2 
1000.0 
1000.0 
