in the fixed principles of the egg during incubation , 
No. 3. 
Sulphuric 
Acid. 
Phospho- 
ric Acid. 
Chlorine. 
Potash, 
Soda, and 
Carb. of 
Ditto. 
Lime, Mag- 
nesia, and 
Carb. of 
Ditto. 
Grains. 
Grains. 
Grains. 
Grains. 
Grains. 
Albumen 
.18 
.48 
.87 
2.72 
.32 
Yelk - 
•19 
4-00 
• 44 
•31 
.67 
Total - 
•37 
4-4 8 
1 *3 1 
3- 2 3 
■99 
Although the consideration of the immediate principles of 
the egg does not fall within my present design, yet I cannot 
refrain from giving the following analysis of the yelk of the 
recent egg. 
The egg from which the yelk had been taken, which is the 
subject of the following experiment, had been boiled hard in 
distilled water, and the yelk, in its moist state, was found to 
weigh 316.5 grains. It was then partially dried by exposure 
to the air for several weeks ; and to remove the remainder of 
the water was reduced to powder, and exposed to a tempera- 
ture of somewhat more than 212 0 . The total loss of weight 
was 170.2 grains, which was supposed to indicate the quan- 
tity of water present. The remainder was now digested re- 
peatedly in alcohol of specific gravity .807, till that fluid came 
off colourless. The residuum was perfectly white and pulveru- 
lent, and possessed many of the properties of albumen ; but 
it differed from that principle, by the large proportion of 
phosphorus it contained in some unknown state of combina- 
tion. The alcoholic solution was of a deep yellow colour, 
and deposited crystals of a sebaceous matter, and a portion 
of a yellow semi-fluid oil. On distilling off the alcohol, the 
