316 A FURTHER CONTRIBUTION TO THE 
of my specimen of tartrate of ammonia, so that I had a perfectly neutral solution 
to work with. The flask was prepared and the fluid introduced as above 
described for milk, but the boiling was done by the direct flame and was con- 
tinued only ten minutes. 
The turnip infusion was prepared by boiling peeled white turnips, in about 
enough water to cover them, till they were soft, reducing each to a mash with 
a little additional water, filtering, and keeping the filtrate at 212° Fahr, for 
half an hour, as in the case of the milk. 
The ‘ artificial milk ’ required special preparation. A solution of 160 grains 
of milk-sugar in ten ounces of tap water, which is about the proportion in milk 
according to Miller’s Chemistry, was subjected to the temperature of 212° Fahr. 
for an hour and a quarter in a flask prepared and arranged as for the milk. 
Next day, the fluid being of course cold, I added five drachms of the white of 
a raw egg, the shell of which had been treated twelve days before with one 
to twenty carbolic-acid solution for an hour and twenty minutes and then 
wrapped in carbolized cotton, a process which, I may remark, preserves eggs 
from putrefaction, apparently for an unlimited period, although the carbolic 
acid leaves the cotton in a few days, and that which was applied to the egg- 
shell does not penetrate sufficiently to produce any coagulation whatever of 
the albumen ; and I have lately eaten an egg which had been prepared in this 
manner more than three months before, and for the last fortnight had been 
kept at 100° Fahr. A large pipette having been purified by heat, and protected 
from the entrance of dust in cooling by means of carbolized cotton, a plug of 
which in the upper end served the further purpose of preventing the entrance 
of organisms into it from a syringe with which it was connected by means of 
a caoutchouc adapter, a small hole was made in the shell of the egg with car- 
bolized fingers and heated knife, and the narrow end of the pipette being inserted 
between the yolk and the shell, and a piece of carbolized cotton wrapped round 
the pipette so as to cover the orifice and exclude dust, almost all the white was 
extracted without interfering with the yolk, and transferred at once to the sugar- 
of-milk solution in the flask, the cotton round the pipette serving as a temporary 
screen, for which a substantial cap of the same material was substituted on 
removal of the pipette. Twenty-four hours later, the flask having in the interval 
been occasionally agitated to diffuse the albumen, a syphon was introduced 
with the peculiarity that a piece of sponge was tied over the end of the shorter 
leg to serve as a filter for excluding the shreddy undissolved residue of the 
albumen, the sponge being of course purified by the boiling. The artificial 
milk was thus obtained with only trifling turbidity when decanted into 
experimental glasses, and the stock in the flask has remained unchanged 
