390 Dr. Prout’s experiments on the changes which take place 
observers to believe that an interchange of principles takes 
place between them, while others seem to have mistaken the 
yellow modified albumen for the yelk itself. That an inter- 
change of principles has taken place, at least under the above 
circumstances, there can be no doubt ; yet the tw r o are not in- 
discriminately mixed ; for when the egg has been previously 
boiled, the yelk, though softer than natural, is nevertheless 
rendered of a firmer consistence than the modified albumen, 
and can thus be readily separated from it ; there is, moreover, 
a distinct line of demarcation between them, arising, appa- 
rently, from the proper membrane of the yelk. Another 
argument in favour of the opinion of the intermixture of the 
albumen and yelk at this period, is derived from the following 
analyses of these constituent principles of the egg ; from 
which it will be found, that the quantity of the saline matter 
is diminished in the albumen, and increased in the yelk. It 
is a singular and striking fact, however, that although the 
oily matter of the yelk has made its way to the albumen, 
very little of the phosphorus, which exists in such large 
quantities in the yelk, has been removed with it. 
Unchanged albumen 
Modified albumen, li- 
quor amnii, animal, 
membranes, &c. . 
Yelk. 
No. 1. 
Sulphuric 
Acid. 
Phospho- 
ric Acid. 
Chlorine. 
Potash, 
Soda, and 
Carb. of 
Ditto. 
Lime, Mag- 
nesia, and 
Carb. of 
Ditto. 
Grains. 
•13 
Grains. 
.27 
Grains. 
.19 
Grains. 
I.O3 
Grains. 
.18 
.OB 
.38 
4 5 
1.17 
. 1 2 
b 
CO 
4-°3 
.6 0 
bo 
O 
.68 
.30 
4.68 
1.24 
3 - co 
.98 
