1682 
AV>>0 and Ay>0 [series c and d]. It appears at once from 
series c and d that the curves of group A go starting from the 
invariant point towards lower pressures and higher temperatures. 
In the P,7-diagram [fig. 1] of this group A the curves (A), (A,) 
and (A,) are drawn. The position of those three curves with respect 
to one another follows at once from the direction of the arrow in 
5 a | 
. C . ~ 
table I; hence it appears viz. that the absolute value of ne for 
C 
