Chemistry and Physics. 261 
tities may be rubbed — in a mortar; for large Qo te 
3 per cent. of water must be added and the mixtu 
bronze a with a Sime pestle, and it may then rw owhana 
and dri 
This ii differs from ordinary gunpowder in being explosive 
even in the form of fine powder, no granulation is therefore needed. 
Other advantages claimed for it are its easy formation, the ingredients 
previously powdered may be mixed only when wanted—the want o 
action of air on the separate materials, while charcoal for gunpowder 
is injured by exposure ; and lastly, the greater force. 
On the other hand are its erosive effect on iron barrels, for which 
bronze must be substituted, and its dangerous inflammabilit 
This compound having already obtained a newspaper notoriety has 
probably been very generally tried. The cost of materials and the 
difficulty of keeping it will be a bar to very extensive use. In. our 
Own trials, it was found to become somewhat moist, and the original 
ep eraation was found difficult in the case of the sugar and prussiate 
ag h. 
It is dan ngerous to introduce gunpowder, charcoal or sulphur; the 
smal et quantity caused, in the hands of the discoverer, a tremendous 
a Se ~G. C. Scasrrer. 
4. er tet a Ralls of Chloroform; by Prof. Wm. ; 
taba M.D., (M r. Sciences, in Chem. Gaz., May, 1850.)— : 
Prof. G. in general he the fetes of Soabeteha and Mialhe.* 
Still even ca the hands of the best manufacturers, chloroform has 
until recently been found contaminated by chlorinated oils mentioned ~*~ 
in our former notice. Prof. G. — the os reeable effects of 
chloroform as entirely due to these oils. It is therefore a matter.of 
Some consequence to have ices tests fae a. purity of this. impor- gh 
tant ig tanc 
and colorless sulphuric acid of 1-84 at least, on a te is 
ooking ae or brown, as the oil is more or less impure. ec oly. 2 
pure Shiceoloren, wees not color the aci 
Pure ehloroform when poure e hand or a handkefehien” » 
rapidly iporaces. while the less yeti ie remain and a Cer. te 
d by their color, which i quite persistent.. Dr. Simpson eit ned * 
became quite offensive 2 the smell left upon them which rema’ . 
after washing. Anot t is the apecliis: net | which for t the pers, 
fectly pure article is 1 500, , 
rt. Kemp, the —— assisiant, ae oiaidiods Ae a 
able tal of purity. As soon as the acid was no longer colored by the™ Ee 
orolorn, the latter exhib a mtrong conve exity” downwards toward,” 
id. ga 
ro The process for purification 
. 
