Caoutchouc Industry. 277 
and we add some further details; for it has required much time and 
experiment to accomplish it conveniently on a large scale. The pro- 
ss is now so far perfected, that caustic baryta may be obtained ata 
very low price. 
After reducing the carbonate to powder, it is mixed intimately with 
cooled. The artificial carbonate is usually reduced more easily than 
the native. However, the native carbonate from England is easily de- 
composed, ; 
Caoutchouc industry.—Since Mr. Goodyear, of New Haven, Ct., has 
discovered the method of preserving caoutchouc elastic at all tempera- 
tures by vulcanization, this substance has become the basis of a branch 
of industry of the highest importance. The vulcanization of caout- 
tion—a discovery, great in its numerous applications, and the services 
which it has rendered to socie 
The several branches of this industry have been undergoing constant 
improvement since they were first commenced. mong them we have 
reat in a former paper, alluded to the manufacture of caoutchouc 
thread. 
methods are well known, and I do not dwell upon them. ocesses 
which I would here mention, are employed by Mr. Gerard, at Grenelle, 
nea i The the advantage of not altering the caoutchouc, 
xt. 
from 2 to 25 p. c. of aleohol. To 1 part of caoutchouc, from 1 to 30 
or 40 parts of the dissolving alcoholized material, according to the 
quality of the paste desired. 
ft ‘ clear lean are applied with a brush, and dry promptly ; 
those in a pasty state are used for making thread, tubes, leaves, etc. 
