Chemistry and Physics. — 319 
tected.— Ber, Berl. Chem. Ges., xvii, 83, Jan., 1884. ee 
_ 5. On the Tenperature obtained by Oxygen in a state of Ebulli- 
hon, and on the Solidification of Nitrogen; b ROBLESKI 
showed no sign of liquefaction at the temperature of —| ; 
Even when this gas is submitted, at the above temperature, to a 
pressure of 150 atmospheres, and the pressure is then sudden] 
r 2 ee : 
Vv 
dently, in order to liquefy hydrogen, we must employ a lower 
temperature than the minimam obtainable by means of liquid 
ich are 
more difficult. to liquefy than ethylene, and which might be used 
for the production of'a much more intense cold, oxygen appeared 
to me to be the most serviceable. 
The conditions under which the liquefaction of oxygen takes 
place being already ascertained by my previous researches, it fol- 
lows that this gas can, at the present time, be liquefied in consider- 
able quantities with ereat ease. umberless processes and appa- 
ratus are conceivable which would allow of this liquefaction being 
effected in such a manner that the commercial production of liquid 
a ae 
solidify like carbonic acid, but it leaves a crystalline residue on 
the bottom of the vessel in which it was contained in the liquid 
liquid oxygen as a cold-producer, is the necessity of ust 
apparatus capable of great resistance. 
able to obtain oxygen in a stable liquid con 
Th i 
°xygen produces at the moment when the pressure moved. 
As these apparatus are in part constructed of glass, great mncon- 
‘ ious explosions. 
venience results owing to the constant danger of ser 
