us 



On the Liquefaction and Solidification [1844, 



little water, I condensed it in the manner already described, 

 and when condensed I allowed half the fluid to escape in vapour, 

 that as much as possible of the less condensable portion might 

 be carried off. In this way as much gas as would fill the capa- 

 city of the vessels twenty or thirty times or more was allowed 

 to escape. Afterwards the following series of pressures was 

 obtained : 



These numbers may all be taken as the results of experi- 

 ments. Where the temperatures are not those actually ob- 

 served, they are in almost all cases within a degree of it, and 

 proportionate to the effects really observed. The departure 

 of the real observations from the numbers given is very small. 

 This Table I consider as far more worthy of confidence than 

 the former, and yet it is manifest that the curve is not consist- 

 ent with the idea of a pure single substance, for the pressures 

 at the lowest temperature are too high. I believe that there 

 are still two bodies present, and that the more volatile, as 

 before said, is condensable in the liquid of the less volatile ; but 

 I think there is a far smaller proportion of the more volatile 

 (nitrogen, or whatever it may be) than in the former case. 



Olefiant Gas. The olefiant gas condensed in the former 

 experiment was prepared in the ordinary way, using excellent 

 alcohol and sulphuric acid ; then washed by agitation with 

 about half its bulk of water, and finally left for three days over 

 a thick mixture of lime and water with occasional agitation. 

 In this way all the sulphurous and carbonic acids were removed, 

 and I believe all the ether, except such minute portions as 



