394 Prout’s experiments on the changes which take place 
An egg, analyzed two days later, or on the 17th day of 
incubation, gave the following results : 
No. 3. 
Sulphuric 
Acid. 
Phospho- 
ric Acid. 
Chlorine. 
Potash, 
Soda, and 
Carb. of 
Ditto. 
Lime, Mag- 
nesia, and 
Carb. of 
Ditto. 
Liquor amnii, mem- 
branes, animal, l 
&c. - - J 
Grains. 
Grains. 
Grains. 
Gains. 
Grains. 
•34 
1.70 
00 
<£> 
2.4O 
1.10 
Yelk - - - 
.10 
2.50 
•30 
•56 
•75 
•44 
4.20 
.98 
2.96 
1.85 
At this period ossification, which, according to Haller 
and others, begins about the 7th day, has made some pro- 
gress. The yelk has parted with some of its phosphorus, 
which appears in the other principles of the egg ; this is par- 
ticularly observable in No. 3. The quantity of earthy matter 
has also increased, particularly in No. 3. 
Experiments on the egg at the end of the third week , or at the 
full period of incubation . 
At this period an egg has lost upon an average about 160 
grains, on the supposition that its original weight was 1000 
grains ; and the weights of the constituent principles of two 
eggs in their moist state and without boiling, were as follow : 
Grains. 
Grains. 
Residuum of albumen, membranes, &c. 
Animal - 
Yelk 
Shell and loss - 
29 5 
555 1 
167.7 
247.7 
38.1 
553*6 
T 5*-3 
257-° 
1000.0 
' 
1000.0 
