256 Correspondence of J: Nickles. 
researches* I proposed to myself to take up this chance observation at 
an — > 70m when I learned by a number of Dingler’s ren. Jour 
nal for 1849 that the fact had also been observed by Mr. eder. The 
subject hoes thus lost for me its special interest, I psblished it ee 
making any claims of priority. 
“Since then, this observation has been taken up by Mr. Ga ion 
who, by mixing the chlorid of sulphur with the sulphuret of carbon has 
e of it several interesting applications. He forms a soft elastic pasté 
with which he prepares the ink-rollers of printing presses. This was 
in 1852 
~ At the same session, Mr. Balard sar the results obtained in 
with the chlorid. On mieten: a given weight of — oil with ai 
forty times its weight of sulphuret of carbon, a en 10 
one-fourth of chlorid of sulphur, the product nai oad for 
eae = 
The chlorid saturated with ian is ——- to the pure chlo 
To succeed in these mixtures, it is necessary to put the — pee 
into the oil, and agitate it, in order to obtain a pales a 
degrees it becomes heated ; the oil hardens more or less soli rt : 
proportions of the chlorid of sulphur. It is necessary to operate Wr 
only small —— of chlorid and avoid the elevation of the temp 
ture. n the mixture is perfect, the material is thrown on 4 polis 
surface, = a plate of glass: after some minutes, it is done. A come. 
the is detached with the point of a knife and ¢ imme 
whole is easily removed. Several layers may be added 
moisture being atid at the moment of the operation. 
plates 
end, it is only needed to place them in a stove in order to 
of chlorid. Cold renders the produets hard and brittle. to har 
r. Perra has not succeeded in making a substance analogous marbles 
_ caoutchouc. He has colored the material or pe it “hie sve oil bef? 
or this purpose'the coloring material is mixed with 
the mater is added. use, 8 
PAs ~ made from vulcanized oil are peepee" for “apo 
retain for a long time a disagreeable odor. e 
by dilute acids or aslinn: In the concentrated sta mae 8 te, the alkalies at 
* On the cause of the variation of angles in tho amor 
homologous Gree. Re dace aie je fi ig Tah “ Comp. 
9. 
