1887.] On the Continuity of the Liquid and Gaseous States. 5 



a 



_ RT 

 P ~ v~b TV' 



where R, 6, and a have the same meaning as in van der Waals' 

 formula. This formula expresses the results of experiments with 

 great accuracy, where the volume of 1 gram of ether occupies not 

 less than 25 c.c. ; but at smaller volumes it ceases to represent the 

 facts. 



It is to be noticed that both Clausius's equation and ours introduce 



