', 111 tlï'A I'ctlC 1T300 dl. JU IllllJI ».v/»lx_. v%:\J^^ 



liibstaiice liad a smaller conductivity, 

 while it could he ascertained by determinations of the freezing-point 

 that it had not entirely split np into its components in aqueous 

 solutions. 



The discovery of this compound made a renewed investigation of 

 the boro-pyro-catechates necessary. 



') Recueil 37, 184 (1917). 



') Cf. These Proc. following communication. 



Proceedings Royal Acad. Amsterdam. Vol. XXVI. 



