( 614 ) 
In a subsequent communication I hope to indicate the course of 
the isobars in the case given here, and to examine by the aid of 
a general survey of the possible combinations of a’s and 6’s,, whether 
besides the diagram of isobars given by VAN DER Waats and the one 
treated here there are other diagrams of isobars possible for mixtures 
of normal substances with «’s and 6’s which are quadratic functions of 2. 
ERRATU M. 
p. 294 line 20 read 6 ba de, for 6beda. 
22 read 8idcha, for 8dabce. 
? 
(February 25, 1909). 
