ORIGIN OF SUGAR IN THE ANIMAL ECONOMY. 97 
microscope of moderately high power, between two pieces of 
glass. A comparative experiment with good wheaten flour, 
&c., will then immediately convince the operator if any 
adulterating ingredient is present. When the chemist is 
often called upon to perform such analyses, it is advisable 
for him to set up several specimens of the cellular matter 
from the different varieties of flour, &c., in glass cells in the 
acid solution, so that he may always have them at hand 
when required for comparative examination. By this process, 
I find, one or two per cent., and even less, of adulteration 
may be easily detected. This method of analysis possesses, 
moreover, the additional advantage of taking up but a short 
time for its completion ; a matter which is often of no slight 
consequence to the analytical chemist. — Chemist. 
Bristol Laboratory ; May 18. 
ON THE ORIGIN OF THE SUGAR IN THE ANIMAL ECONOMY. 
By M. Poggiale. 
Is sugar formed in the animal economy at the expense of 
the nitrogenous aliments, or of the fatty matters when fecu- 
lent aliments are not administered ? Is it produced by the 
digestive action or in the circulation ? These are the im- 
portant questions which I intend to treat of in this memoir. 
First Question. — Can Sugar be formed in the Animal 
Economy at the expense of Nitrogenous Aliments or Fatty Matters ? 
First Experiment . — I have carefully analysed the milk of 
several bitches, subjected successively to different regimens. 
For the estimation of the sugar of milk, I have used the 
process which I mentioned some years ago, and which con- 
sists of applying the method of volumes and the process of 
M. Barreswil to the determination of sugar of milk. 
The milk of a large bitch, fed in my presence, at Val-de- 
Grace, on meat and bread, was analysed, and the following 
results were obtained : 
Water 7341 
Fatty Matter 8 18 
Caseum ........ 13 04 
Sugar of Milk ....... 2'89 
Salts, soluble and insoluble .... 2 08 
9960 
The same bitch was then fed exclusively on meat for 21 
xxix. IS 
