268 Scientific Intelligence. 
inasmuch as he has during the last twelve years, repeatedly rectified sul- 
phuric acid in the manner indicated—r. H. 8. 
3. Vulcanization of Caoutchouc, by means of mixed Sulphur and Hy- 
pochlorite of Lime—Gavutier pe Cravsry, having detected the pres- 
ence of chiorid of calcium in many samples of vuleanized rubber, and 
becom 
violent that the cork will be blown out, or the flask broken by a violent 
explosion.— Comptes Rendus, May, 1860, 1, 876. 
4. Preparation of Cyanid of Barium, and of Ammonia with the Ni- 
trogen of the Air; by Marauerrrre and Dz SourpevaL.—In a brief pre- 
That baryta when calcined in the presence of charcoal and of atmos- 
rien air combines — readily with carbon and nitrogen, cyanid of 
UNS Se Oe ee TR ae 
That the cyanid of barium heated in a current of aqueous vapor - 
decomposed at a temperature of about 300° (C.) [ 572° F,] and disen- 
PP ee ae 
1100. 
un-Cotton Filters ; by Prof. Borrrazr.—Since gun-cotton—itself 
a product of the action of strong acids—when properly prepared js scarcely 
at all acted upon at the ordinary temperature, by chemicals, being capa 
* To prepare baryta from its carbonate, M. and De S. ignite a mixture of the 
latter with the ig (“asphaltum”) of coal tar. Each pale te of the carbonate 
g thus brought in contact with the reducing agent, carbon, excellent resu 
eines. the decomposition of the carbonate reba easy and the product of te 
) . ‘ was a ti 8 0 
ors W 
led to the important discoverie i i i é j Chimie 
; ; s which are noticed in the text.—Répertoire d¢ 
applig. June, 1860, ii, pp. 169, 170. 3 
; 
: 
4 
th 
; 
r 
