Chemistry and Physics. 253 
moderate and regulate the galvanic light; the author interrupted the 
circuit repeatedly by separating the carbon-poles from each other and 
then causing them to approach again; at every new contact the origin- 
_ ally white light showed itself upon the carbon of the negative pole, but 
soon after the completion of the circuit the combustion began at the 
positive pole, the carbon here became hollowed out and emitted a far 
d 
the electric light becoming wholly insensible.—Comptes Rend., xxx, 
359, and Pogg. Ann., 1850, No. 10, 318. 
perature of from t and passing over it a current of dry air, it 
then crystallizes by fusion in prisms of very large dimensions and is 
Chimie et de Physique, October, 1850. 
» On the employment of Hydrogen in Mineral Analyses.—Rivor 
d d 
* This volume, p. 108. 
