20 M. V. Regnault on the Elastic Forces of Vapours 



These tables show that mixtures of sulphuret of carbon and 

 aether, far from giving vapours of a tension equal to the sum of 

 the tensions of the two separate vapours, exert an elastic force 

 which is generally less than that which would be produced by 

 the most volatile of the two liquids. The difference increases in 

 proportion to the volume of the less volatile liquid. 



As it was my intention only to study the phsenomenon in its 

 general bearings, I did not take great care in the determination 

 of the quantities of liquids mixed, particularly as their propor- 

 tions change by the mere fact of vaporization. I have had an 

 apparatus constructed by means of which I proposed to continue 

 these experiments, operating with exactly known and suitably 

 graduated mixtures, and which would allow the determination, 

 at any moment, of the constitution of the atmosphere of vapour. 

 Time has not hitherto permitted me to make use of it. 



