gas in the remainder when agitated with oil of turpentine: 10.5; 10; 10.1; 13.1; 28.3; 61.8. Whether carbonic oxide was present in any of these undissolved portions I cannot at present say.
In reference to the part dissolved, I wish as yet to guard myself from being supposed to assume that it is one uniform substance; there is indeed little doubt that the contrary is true; for whilst a volume of oil of turpentine introduced into twenty times its volume of olefiant gas cleared from ether and the acids, absorbs 2½ volumes of the gas, the same volume of fresh oil of turpentine brought into similar contact with abundance of the gas which remains when one-half has been removed by solution only dissolved 1.54 part, yet there was an abundant surplus of gas which would dissolve in fresh oil of turpentine at this latter rate. When two-thirds of a portion of fresh olefiant gas were removed by solution, the most soluble portion of that which remained required its bulk of fresh oil of turpentine to dissolve it. Hence at first one volume of camphine dissolved 2.50, but when the richer portion of the gas was removed, one volume dissolved 1.54 part; and when still more of the gas was taken away by solution, one volume of camphine dissolved only one volume of the gas. This can only be accounted for by the presence of various compounds in the soluble portion of the gas.
A portion of good olefiant gas was prepared, well agitated with its bulk of water in close vessels, left over lime and water for three days, and then condensed as before. When much liquid was condensed, a considerable proportion was allowed to escape to sweep out the uncondensed atmosphere and the more condensable vapours; and then the following pressures were observed:-
| Fahr° | Atmospheres. |
| -105 | 4.60 |
| -100 | 4.82 |
| —95 | 5.10 |
| -90 | 5.44 |
| -85 | 5.84 |
| -80 | 6.32 |
| -75 | 6.89 |
| -70 | 7.55 |
| -65 | 8.30 |
| -60 | 9.14 |
| -55 | 10.07 |
| -50 | 11.10 |
| -45 | 12.23 |
| -40 | 13.46 |
| -35 | 14.79 |
| -30 | 16.22 |
| -25 | 17.75 |
| -20 | 19.38 |
| -15 | 21.11 |
| -10 | 22.94 |
| -5 | 24.87 |
| 0 | 26.90 |
