SIE B. C. BEODIE ON THE CALCULUS OF CHEMICAL OPEEATIONS. 825 



135*5 as the density of the vapour of mercuric chloride, 1 volume of mercuric chloride 

 is decomposed into 1 volume of chlorine and 1 volume of mercury. 



Hence, putting a"'^"''^^ as the symbol of the unit of mercuric chloride, and u'y''^ as 

 the symbol of the unit of mercury, 



and 

 whence 



The minimum solution of these equations gives 



m =1, n =0, 



7^2= 1, «2=1' 



whence we have 



Symbol of mercuric chloride . . a:)c^h. 



Symbol of mercury J, 



and 



w(S)=100. 



