oo sodium line D may also be 
414 Scientific Intelligence. 
normal temperature and pressure, must be subtracted from the reduced 
volume of the mixture of gas and vapor. 
When the substance cannot be heated to its boiling point, the authors 
employ a process which is similar in principle to that of Dumas, but dif- 
ferent in execution. Two bulbs, holding together about 300 cubic centi- 
meters, are connected and drawn out on either side into a narrow tube. 
On one of these narrow tubes, three or four small bulbs are blown; the 
in dry air, introduced into a bath and a current of dry hydrogen gas 
Ps through. The bath is then to be filled with warm water and 
of closings The water is now allowed to flow out of the bath till the 
bends of the side tubes are uncovered, the bulbs remaining cove 
into the bulbs, absorbing the vapor and leaving the hydrogen. wel 
source of heat, instead of the ordinary gas burner. The metallic on 
may be introduced into the flame by means of a little piece of gas-reto of 
carbon. By employing the so-called Drummond’s light, the inversion 
au projected on a screen; it is only necessary 
that the light should pass through the flame of an alcohol lamp contain 
ing salts in solution— Comptes Rendus, liv, 169. oe 
pt On the spectra of phosphorus and sulphur.—Seaurs has examin 
* spectra produced by volatilizing sulphur and phosphorus in 4 current 
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