Technical Chemistry. | ae 429 — 
Although the specimens came from three different milkings, the results 
may nevertheless be regarded as a continuous series of determinations of 
the solubility of the fat in milk which had been kept from two to = 
The solubility of the fat increased with the a. 0 me ilk, fr 
0:55 per cent in that kept for two hours, to 4°56 per n that kept 
during 109 hours, evidently in consequence of the pi of the en- 
velopes of the particle s of butter, which had meanwhile been going o 
It is probabe that this solution of the coverings of the particles of bays 
ter is attended with oxydation, for the air of the vessels in which the milk 
was preserved contained less oxygen at the close than at the commence- 
ment.of the experiment; from the experience of dairies it is also to 
inferred that the solution of the envelopes of the particles of butter is re- 
tarded both by Jow and by high temperatures. Perhaps this solution is 
independent of the ordinary acid fermentation, but a more probable sug- 
v 
zs 
Zz) 
<. 
° 
==) 
77 
a 
oe 
oa 
— 
ior 
fa) 
om 
ue 
a 
o 
2) 
co 
nm 
g, 
a 
oe 
on 
Ry 
=) 
o 
cal 
tas 
~ 
ot 
o 
Ez 
% 
ss 
oO 
e 
which excites the acid fermentation of the milk iegen3 in one stage 
which the caseine is coagulated. 
The described solution,—or rather alteration, which the author propo- 
ses to designate as the “sweet fermentation (Siisse Gahrung) of milk” 
must be of importance in explaining the rationale of the preparation of 
butter,—in which the chief object is to accumulate the fat particles with- 
out at the same time collecting any admixture of caseine.—Journal fir 
praktische —* Ixxxii, 13, 1861, No. 1. 
é is from the geek ssc of Gunpowder under different press- 
ures; by B. P. Craic.—The perusal of the paper of Bunsen and Schis- 
koff on “ The Chueh Theory of Gunpowder,” whose publication about 
tng years ago attracted much. attention, (This Jour., [2], xxvi, 106), le 
e, as it no doubt did others, to make some experiments on n the residues 
of exploded powder. 
The inv estigations 0 of the above-named chemists were made on the pro- 
Such is actually the case, for the solution obtained by washing a gun 
with well boiled distilled water, immediately after its discharge, and filter- 
ing while hot, will = fuund to a conte in sulphuret of potassium with v ery 
ishoff | 
are colorless after the suspended carbon has been allowed to settte, or has 
been removed by filtration. 
e color above spoken of, is exactly the tint of a solution of a sesqui- 
salt of chromium ; it is not impaired by filtration of the liquid, but dis- 
appears in a few hours by exposure to the air, and immediately by the 
7 
