Memoir upon Animal Fat. 105 
3d, That upon giving nothing but animal food to diabetic 
patients, their urine speedily changes; that at first we find 
an albuminous matter in it; that this albuminous matter, 
which always increases for some days, is an unequivocal 
sign of a speedy cure; that afterwards this albumen gradu- 
ally disappears ; that the kidneys then begin to secrete the 
substance called wea, uric acid, and also the acetous acid; 
the urine soon becomes like that of an individual in health. 
Notwithstanding all this, however, the patient, in order 
to prevent a relapse, ought to observe the animal regimen 
for along time, and avoid every thing which may tend to 
cause the reappearance of diabetes. 
—————— nna 
XX, Memoir upon Animal Fat. and some Medicinal Pre- 
parations which are administered through that Medium. 
By M. Vocey. 
{Concluded from p. 81,] 
Fat and the Metals. 
I; has been ascertained that fat acts more or Jess upon a 
great number of the metals. Copper, for instance, gives a 
green colour to fat, when the air also is allowed to act upon 
it. The solution of the oxide of copper in fat is a fact 
proves by daily experience. 
As mercury, however, is the metal which excites most 
interest in the pharmaceutic art in its combinations with 
fat, I shall restrict myself particularly to discussing the ef- 
fects of these combinations. 
Several apothecaries have endeavoured to improve the 
quality of mercurial ointments, and particularly of the 
double ointment. M. Vean-Delaunay proposed rancid oil, 
and M. Fourcroy has shown that oxygenated fat is most 
proper for killing mercury. 
Of late, several chemists have imagined that the mercury 
of the double mercurial ointment is not oxidated, but that 
it exists in the metallic state, 
I know 
