Chemistry and Physics. 267 
6. New method of reduction especially applicable to a large number 
of meials—Mr. Poumaréde has proposed to use the vapor of zine as a 
ucing agent, and has obtained by this means a large number of inter- 
esting products. Peligot, exhibited to the Academy of Sciences, at its 
session, March 28, specimens of nickel and cobalt thus made, and also 
magnificent crystals of iron. 
1. Bromid of potassium, a powerful narcotic—Bromid of potassium 
after having been used as a remedy against diphtheria, photophobia, ete., 
has been proved to be a powerful narcotic. It produces its effects with- 
Be As 
; .D, 
third London edition. New York, John Wiley. 1864. 512 pp. 8vo.— 
e alkaloids, Prof. Johnson has substituted the accurate and plain 
eo. nplete to the date of publication. The value of this text-book is too 
well recognized to be ouleand upon here; it has already passed through 
Sag pat: the solid condition, the tendency 
In the gaseous, the liquid, or perhaps the s Ee ee, Ua 
changed. The foree of cohesion binding the molecules together exercises 
ho effect on the rapidity of vibration. 
