utew^xiTI \n vA'in vacuo and in Gases. ^^H V .M 271 



elastic force of the vapours furnished in vacuo by volatile liquids, 

 mixed or superposed. 



Lastly, in the fifth I shall give the results of the experiments 

 which I have made to decide whether the tension acquired in 

 vacuo is, or is not, dependent upon the solid or liquid form of 

 the body which furnishes it. >*t 



Part I. — On the Elastic Forces of Vapours at Saturation in 



vacuo. 



I shall not stop to describe the processes which I have em- 

 ployed in determining the elastic forces of saturated vapours in 

 vacuo. These processes are similar to those applied by me to 

 the vapour of water, which are described in detail in vol. xxi. of 

 the Memoir es de VAcademie. 



Nor do the limits assigned to this note allow of my giving the 

 immediate results of my determinations, which are very nume- 

 rous. I shall merely give the elastic forces at every 10° C. of 

 the following liquids, which I have studied between the most ex- 

 tended limits. These are alcohol, sether, sulphuret of carbon, 

 chloroform, and essence of turpentine. 



These results have been obtained, either by the determination 

 of the elastic forces in vacuo, or by determining the temperature 

 of the vapour of a boiling liquid under the pressure of 



an 



