SIE B. C. BRODIE ON THE CALCULUS OF CHEMICAL OPEEATIONS. 829 



Again, by similar reasoning, putting ««*»•, for example, as the symbol of styrol, 



whence 



and we have as the symbol of styrol «*«**. 



The following are examples of symbols thus determined : — 



Marsh-gas aV. 



la 



-'«^ 



ax. 



2x 

 S..2„ar 



Acetylene «»■ 



defiant gas a****. 



Methyl a'x^. 



Propylene a 



Ethyl , 



Allyl «»««', 



Formic acid ' ax'^. 



Methylic alcohol . . . . aV^. 



Oxide of ethylene a'x'^^. 



Acetic acid a'«'^|'. 



Butylic alcohol a'***!. 



Benzoic acid a'x^'l*. 



Chloride of methyl a'^*'. 



Chloride of ethyl u'yyc 



Chlorine derivatives of chloride of ethyl, 1 . . u'x^x 



5J 5» 5) 5) ^ , , a ^X. . 



3„3 4 24P 

 • • ** X * • 



Chloride of butylene u\^x*'. 



Chloride of amyl a';^**. 



Chloride of benzoyl a*X*"l- 



Cyanogen avV^. 



Cyanide of methyl aVx**. 



Ethylamine aVx". 



Cyanide of butyl a^m^. 



Cyanide of amyl a*****. 



Were we thus to proceed to construct the symbols of the gaseous compounds of carbon 

 with the elements of which the symbols have already been determined, it would be 

 found that in all cases these symbols could be expressed by an integral number of the 

 prime factors a, |, fl, X, ;^, a;, y, . . . ., and that the index of the factor x was always of the 

 form mx, m being a positive integer. 



The only hypothesis which can be made as to the value of x, which shall be at once 

 necessary and sufficient, is that a:=l, in which case w(«)=6, and W, the density of 

 carbon, =y X 6. This hypothesis is based upon a very large number of observations of 



MDCCCLXVI. 6 U 



