Arseniuretted 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 0° Fahr. In the following table of the elasticity of its vapour the marked results are experimental, and the others interpolated:—
| Fahr. ° |
Atmospheres. | Fahr. ° |
Atmospheres. | Fahr. ° |
Atmospheres. | ||||||
| √ | -75 | 0.94 | -30 | 2.84 | √ | 10 | 6.24 | ||||
| -70 | 1.08 | √ | -23 | 3.32 | √ | 20 | 7.39 | ||||
| √ | -64 | 1.26 | -20 | 3.51 | 30 | 8.66 | |||||
| -60 | 1.40 | -10 | 4.30 | √ | 32 | 8.95 | |||||
| √ | -52 | 1.73 | √ | -5 | 4.74 | √ | 40 | 10.05 | |||
| -50 | 1.80 | √ | 0 | 5.21 | √ | 50 | 11.56 | ||||
| -40 | 2.28 | √ | 3 | 5.56 | √ | 60 | 13.19 | ||||
| √ | -36 | 2.50 | |||||||||
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, caoutchoucine, 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 0° loses the greater part of its colour, and then fuses into a white, crystalline, brittle and but slightly translucent substance, which fuses a little above 0° Fahr. The green and probably hydrated acid required a much lower temperature for its solidification, and then became a pale bluish solid. There were then evidently two bodies, the dry acid which froze out first, and then the hydrate, which requires at least -30° below 0° before it will solidify.
The following gases showed no signs of liquefaction
