214 



THE EARL OF BERKELEY ON SOME 



POTASSIUM Alum 



The solubilities were determined in the Jena glass bulbs. Column IV. gives the 

 number of grain molecules in the litre calculated on the assumption that the anhydrous 

 salt is K 2 AL (S0 4 ),. 



RUBIDIUM Alum. 



Solubilities in Jena glass bulbs. 



Column IV. gives the number of gram-molecules 

 calculated on assumption that the anhydrous salt is Rb.,Al.j 



