one atom of sulphur, and one atom of chlorine, and that the red is a 
bichloride, formed of one atom of sulphur and two atoms’of chlorine? 
swiltew. Rineytoaione,; #832..°° eA 
iat Density.of the vapor of sulphur and of ti tect 
searches of Dumas on these points, have also obtained the: — 
tion of the same distinguished chemists. 
. To determine the donsits of the manne of sulphur, sauaies had 
camped to the known analogy of with oxygen. Thus 
the vapor of water is formed of.one mart of hydrageny aod half a 
volume of oxygen, whence it was d hydro 
gen contained in like manner, half a voluine of sulphory and one vol- 
pe hydrogen. Now the density of bydrogen being 1.1912, that 
of the vapor of sulphur should be 2.24.* Such was, in fact, the num- 
ber generally adopted. Dumas, however, in several experiments 
conducted with great care, found it to be just about three times as 
great, which induces him to believe that there is only one sixth of 
the vapor of sulphur in sulphuretted hydrogen, as in sulphurous acid. 
Phosphorus was subjected Be eared Hahn andes 
density of its vapor was in roigar mink Cormis be different from 
a educed from the density and analysis of 
ie gas, agreeably to the supposed analogy bnerena lah 
The density, by direct n 
to be 4,32, 30, the double of that generally accepted.—Idem. 7 ns fs) 
. Preservation of substances by means of alkalies—M. Pavex 
ay preserved, during many months, polished instruments of iron and 
steel by keeping them in solutions of potash or soda,—saturated so-. 
diluted with one, two or three times t their weight of watery 
He at first thought that: the ) the dis- 
appearance of the air and carbonic acid in the alkaline ixtur 
but he afierwards concluded that alkalinity acted an essential part i in 
the p : 
h: enon. In fact a very small: quantity: of allah te wulticienrs 
! us 5 | ga'sz and even z,'s5 of caustic potash in water, will preserve 
m. oxidation, bars of iron, &c. immersed in it. Lime water di- 
ted. with its own weight of water, or of course without 
aswer the same purpose. Alkaline carbonates and borax have the 
Sapte but. nates must amd be stronger.-—-Rem Dncye. 
hese nam bede are diferent from those heretofore used, and we cave not ae- 
cess to the authority.—Ed. 
ar 
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