NOTE ON THE SPECtFlC VOLUMES OF AROMATIC COMPOUNDS. 409 



Ubserved. Cajculated. 



Kopp. Scliiff. C = 14 & ll,H=;i.r.. 



lîeiizeiie a H,; Ü5.8... 95.94 .... 96 



Toluene C, H,. CHa —...117.97 ... 114 



Xylene C, H,. (CH;0, — ... 1 39.74 ... 132 



Ethyl benzene C„ H,. a H, —...138.93 ... 132 



X. l'ro[>yl benzene an,. C;H-"" —...101.82 ... 150 



r. Ethyl toluene C„H,.CPl3.aH,-,.. —...161.94 ... 150 



Mesitylene C„ H^. (CH,)3 —....162.41 ... 150 



Cymene C„1I,. CII3. CJl;" 183.5 ... 184.46 ... 168 



Xiiiihthalene Ci„ Hs 149.2... — ... 147 or 153* 



The above table clearly sliow.s the foult of the method of calcu- 

 lation employed by Mr. Kuhara, which when ajiplied to simpler 

 aromatic compounds containing oxygen gives results (Ijy chance?) 

 fiirlv agreeing v\-ith the experimental values, but which when ap[)lie(l 

 to the aromatic hydrocarbons gives results entirely at variance with 

 those experimentally deiennincd. 



Using the same method of (.■alculati<_)n and (,)n the suppositic/U 

 that oxygen is ketonic, Mr. Kuhai-a iinds that the observed specilic 

 volume of camphor agrees almost exactly with tlie calculated vahie, 

 and draws therefore a probable conclusion that its constitution is 

 correctly represented by one of the following formulae : 



* Mr. Kuliara makes naphUmlene = 150, but it seems to me that the two possible ways of 

 calculatiou consistent -n-ith those adopted for otlier tjodies are : 



(1) (2) 



C';! = 3 X 14 = 42 Cs = .") X 14 = 70 



Ct = 7 X 1 1 = 77 C.i = 5 X 11 = 0.') 



Hs =8 X 3.5 ^ 2S Hk =8 x 3.5 = 28 



147 153 



