112 Mr. Hatchett’s Experiments on a Substance , 
then mixed, a large quantity of distilled water was added, 
and the alcohol was separated by distillation. 
On the surface of the remaining liquor, when cold, a white 
crust was formed, which being separated, was found to pos- 
sess the properties of spermaceti, and weighed 18 grains. 
The filtrated liquor was then evaporated to a small quantity, 
became of a pale brown colour, and was rendered turbid by 
solution of isinglass. 
Animal Fat. 
This experiment was made upon the kidney fat of veal, but 
I cannot take upon me to assert that the results would have 
been the same with every kind of fat. 100 grains of it with 
one ounce of concentrated sulphuric acid, after some time, 
formed a blackish soft mass ; a second ounce of sulphuric acid 
was then added, and the whole was digested and occasionally 
heated during nearly three months. Six ounces of distilled 
water were poured upon the black pulpy mass, and formed a 
thick uniform liquid, which, after digestion for six or seven 
days, was when cold filtrated. The liquor which passed was 
of a brown colour, and upon evaporation became black, leav- 
ing a considerable portion of a blackish substance upon the 
filter, which was added to that which had been collected by 
the first filtration. The whole was washed with cold water, 
which passed colourless. Boiling water was then poured 
upon the filter, by which a considerable portion was rapidly 
dissolved, and a brownish-black solution was formed, which 
copiously precipitated gelatine. 
The residuum on the filter was then dried, and being col- 
