1887.] 



On Pliosphonium Chloride. 



287 



alteration in the direction of the curve, if the phenomenon of fusion 

 is analogous in this case to that of melting ice. However, such an 

 alteration can scarcely be seen in the diagram, but would doubtless 

 be made apparent by very careful observations. 



1<1G. 2. 



In the second diagram I have plotted curves representing the 

 saturated volumes at different temperatures. To make them com- 

 parable it is necessary to take definite masses of the gases. I have 

 therefore plotted the volumes corresponding to 70*5 mgrms. PH 4 C1, 

 34 mgrms. PH 3 , and 36*5 mgrms. HOI. It will be observed that 



