185 



appears with the greatest clearness that the vapour pressure line of 

 liquid white phosphorus cannot be the prolongation of the vapour 

 pressure line of liquid red phosphorus. 



This, however, follows still more clearly from the line ffg, which 

 gives Tlnp as function of T. 



In contrast with the line ///• this line is not straight, but exhibits 

 an e^er increasing slope at higher temperatures. So the heat of 

 evaporation is here undoubtedly a decided temperature function, 

 which we shall discuss on a following occasion. The most convincing 

 proof of the lack of correspondence of the vapour tension lines ah 

 and cd is this that when the line kh is prolonged towards lower 

 temperatures, it intersects the line r/}/ at a rather large angle, from 

 which it appears still more convincingly than from the lines ah and 

 cd, that we have here certainly to do with two different curves in 

 the same way as for the system Cyanocjen. 



To set forth still more clearly the regular course of the vapour 

 pressure line ah. it has, just as the curve for Tlnp, been once more 

 separately represented in Fig. 5. In this figure also the points 



J.= ^iat. Mjd^._ ^M)m>. 



0= oXjoX.Mjë^.-önmkit,^ jhohrunA. 



+500 



-500 



^f1000 



-1500 



-0000 



1500 



