174 



DR. FARADAY ON THE LIQUEFACTION AND SOLIDIFICATION OF 



Stance appears to be produced in every stage of the preparation of defiant gas. On 

 taking six different portions of gas at different equal intervals, from first to last, 

 during one process of preparation, after removing the sulphurous and carbonic acid 

 and the ether as before described, then the following was the proportion per cent, 

 of insoluble 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 un- 

 dissolved portions I cannot at present say. 



In reference to the part dissolved, I wish as yet to guard myself from being sup- 

 posed 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 defiant gas cleared from ether and the acids, absorbs 2| 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 solu- 

 tion 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 re- 

 moved, 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 be- 

 fore. 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 : — 



On examining the form of the curve given by these pressures, it is very evident 

 that, as on former occasions, the pressures at low temperatures are too great to allow 

 the condensed liquid to be considered as one uniform body, and the form of the curve 

 at the higher pressures is quite enough to prove that no ether was present either in 



