in the Fixed Principles of the Egg during Incubation. 71 
The following are the results of an analysis made two days 
later, or on the tenth day of incubation : 
Sulphuric 
Acid. 
Phosphoric 
Acid. 
Chlorine. 
Potash, So- 
da, and Car- 
bonate of 
ditto. 
Lime, Mag- 
nesia, and 
Carbonate 
of ditto. 
Grain. 
Grains. 
Grain. 
Grains. 
Grain. 
Unchanged albumen, 
.27 
.14 
.24 
1.13 
.12 
Modified albumen, \ 
liquor amnii, ani- 9 
mal, membrane, > 
&c. - \ 
.08 
.65 
.68 
1.36 
.27 
Yolk, 
.05 
3.35 
.30 
.62 
.66 
.40 
4.14 
1.22 
3.11 
1.05 
At this period the proportion of phosphorus is somewhat dimi- 
nished in the yolk, and increased in the animal and its appen- 
dages. The chlorine and alkaline principles seem also to have 
diminished in the jyolk, and to have increased a little in the al- 
buminous portion. 
Experiments on the Egg at the end of the second weefc . 
At the end of the second week of incubation, an egg has lost 
upon an average about 130 grs., on the supposition that its ori- 
ginal weight was 1000 grs., and the weight of the constituent 
principles of two eggs were as follows : 
| Unchanged albumen, 
Grains. 
175.5 
Grains. 
208.0 
I Liquor amnii, membranes, &c. 
273.5 
218.2 
| Animal, - 
70.0 
89.1 ! 
Yolk, - 
250.7 
248.0 
Shell and loss, - 
230.3 
236.7 
1000.0 
1000.0 
At this period the animal has attained a considerable size, 
while the albumen has become diminished in a corresponding 
degree. The albumen has also acquired a very firm consist- 
ence, especially when coagulated by heat. The liquor amnii 
has become more fluid, and the modified albumen formerly men- 
tioned, has very much diminished in quantity, or disappeared. 
The yolk, which at the end of the first week seemed to have 
