Chemistry and Physics. 115 
numerous wor re executed ssingault. tuated in a 
region peculiarly agricultural, and one of the richest in 
ine—su ed with vineyards and cultivated fields of other 
oc 
Leblanc on the use of the submarine boats of M. Poyerne in fishing 
for coral and sponges ;—a report of M. Barreswill on a manufacture of 
caoutchouc thread, just established at Grenelle by MM. Gérard and Au- 
bert, and which constitutes a new branch of industry, as the Gerard 
process substitutes a thread of india rubber obtained by pressure for 
the uneven thread used in elastic tissues made mechanically by cut- 
ling, ete. 
The “ Société d’Encouragement” is occupied with a multitude of 
questions in applied science, but I am compelled to refer the reader for 
particulars to a future communication. 
Il. Caemistry AND Puysics. 
+ 
1. Specific heat of gases and vapors.—REGNAULT has communicated 
to the Academy of Sciences some of the numerical results obtained in 
hese are as follows. The column A gives the specific heats by 
weight, and B by volume. be 
ie * This Journal, xv, p. 112. 
