404 Scientific Intelligence. 
quantity of water, evolves 148 calories. Consequently the forty 
kilograms of acid would have evolved heat enough to give rise to 
an instantaneous production of eighteen or twenty cubic meters of 
e 
made, however, at 18°, and the author is examining the production 
of heat when the mixture takes place at higher temperatures.— 
Bull. Soe. Ch., Ul, xxxiii, 50, Jan. 1880. FB 
n the Equivalence of Boron.—In an investigation of the 
phenyl derivatives of the nitrogen series, Michaelis had shown 
oride appears distinctly if a 
enyl group replaces chlorine. Thus phosphorous chloride, 
4. On the Direct Union of Cyanogen and Hydrogen.—BEr- 
THELOT has succeeded in causing cyanogen to unite directly with 
hydrogen under the influence of heat; The pure and dry gases, 
mixed in equal volumes and passed slowly through a narrow tube 
heated to 500°—550°, combined to an extent of two or three per 
cent, But if the action be prolonged, the mixture being con 
tained in a sealed tube and heated to the above temperature for 
fe) 
transformed into paracyanogen. The phenomenon differs from 
g P 
the synthesis of hydrogen chloride only in its greater slownes® 
the more elevated temperature required, which is th 
