66 THE ROYAL SOCIETY OF CANADA 
by the dilatometer in these laboratories and found to be 35° C. The 
double salt undergoes the transformation indicated by the reaction. 
3(K2COs, NazCQs, 12H:0) x 2K2CO; — 26H:0 + K2CO3, 3Naze COs, 
10H.O. The latter double salt was described by Hugounenq and Morel,! 
who give no details as to the limits of its existence and are apparently 
unaware of the above transformation. Preliminary tests made here 
indicate the probability of a transition point at about 130° C., in the 
case of the latter salt. | 
The investigation into the conditions under which both of these 
double salts exist is still in progress. 

1 Compt. rend. 106, 1158 (1888). 
