272 Scientific Intelligence. ae 
Amorphous boron reduces the chlorids of mercury, lead, and silver, at 
a high temperature with production of chlorid of boron. Galena is re- 
duced in a similar manner, metallic lead being set free and a sulphid of 
boron formed. In conclusion the authors direct attention to the fact that 
nitrogen, hitherto considered a passive and inert substance, may under cer- 
tain circumstances become an active agent. They announce the discovery 
of a simple mode of preparing the nitruret of silicon which will form the 
subject of another memoir.— Comptes Rendus, xlv, 888. W. G. 
6. On the Magnetic Induction of Crystals ; by Professor Juius 
Piicxer of Bonn, For. Memb. R. S., Hon. M.R.L, &e. (Proc. Roy. Soe. 
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the new definition, directions whic in common with the an" 
crystallographic axis of uniaxal crystals, the property that if the eg “ 
be suspended so that either of t “ax vertical, and t i 
which or author had been led by considerations of a dif ne 
: verification had the most complete success. But ‘lore rather 
to it, it was found necessary to aa Poisson's theory itself (o* 
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verification of the hypothetical conclusions and their page Y nd. 
