188 Systems of Chemical Notation. 
As M. Berthelot himself observes, we only differ in the opin- 
ion that each of us has formed on the part and relative im- 
acid. But if this has led me to group together two molecules 
of an alkaline chloride or nitrate, I was obliged, for the same 
reason, when taking the specific heats of sulphate of alumina or 
of alkaline iti i 
and phosphoric acid PhOS, and that the equivalents of alumin- 
be and phosphorus should be modified accordingly. 
ties of bodies by referring them to chemically equivalent 
weights, in cases where these — neither to molecular 
weights nor to the equivalents usually adopted, but we cannot 
conclude from this “that those weights ought to be adopted as 
symbols of notations, 
