J 844-.] of Bodies generally existing as Gases. 



115 



Arseniuretled Hydrogen. This body, liquefied by Dumas 

 and Soubeiran, did not solidify at the lowest temperature to 

 which I could submit it, i. e. not at 166 below Fahr. In 

 the following Table of the elasticity of its vapour the marked 

 results are experimental, and the others interpolated : 



Fahr. 



-60 



52 



-50 



-40 



--36 



The following bodies would not freeze at the very low 

 temperature of the carbonic acid bath in vacuo ( 166 Fahr.): 

 Chlorine, ether, alcohol, sulphuret of carbon, caoutchoucine, 

 camphine or rectified oil of turpentine. The alcohol, caout- 

 choucine and camphine lost fluidity and thickened somewhat 

 at 106, and still more at the lower temperature of 166. 

 The alcohol then poured from side to side like an oil. 



Dry yellow fluid nitrous acid when cooled below loses the 

 greater part of its colour, and then fuses into a white, cry- 

 stalline, brittle and but slightly translucent substance, which 

 fuses a little above Fahr. The green and probably hy- 

 drated acid required a much lower temperature for its solidifi- 

 cation, and then became a pale bluish solid. There were then 



I 2 



