266 PEOFESSOa B. C. BEODIE ON THE ATOMIC WEIGHT OF GEAPHIIE. 
This corresponds to the formula C„H,0, which has the following composition:- 
C: 
H 
O 
'22 
264 
2 
64 
80-00 
0-60 
19-40 
10 ^ 
There is every reason to believe that, although the decomposition is Mcult “ 
Ss sal holy is formed by the simple application of heat to the substance wrthout the 
intei-vention o^f the naphtha. The result of one experiment, m which the graphic 
haTbeen carefully heald in an air-bath to 280» until it ceased to lose weight, gave to 
lalysis-carbon L-36, hydrogen 0-71. In other experiments numbers approximating 
Welle notlelata to determine with certainty the precise mode of the forma rion 
of this body. The simplest hypothesis which coincides 
that 7 equivalents of the graphic acid give by then- 65 ., 8 
We have 7(0., H, 0.)=1512 and 3(C. H, O,)=990 and lol2 : 990 . . 100 . 60 IS, 
to form the new substance by the elimination of 
water, carbonic acid, and carbonic oxide from the original body, according to the equa ion 
7(C„H4 01 = 3(02, H,04)+6H,04-6 CO, + 0 CO. 
The slight excess of carbon in the last senes of analyses indicates the piesence of .urn 
compound containing a higher pei-centage of carbon. It will be rendered eirdent. bv 
the following experiments, that we have only to heat this substance under slightly 
different circumstances to determine a further decomposition. Portions 
stances last analysed were placed in a pktinum boat in a g l^nmlature 
was passed a current of nitrogen, and w-hicli was heated in an an- < 1 ■ 
of 250°. The substance was weighed before and after the experimen . . r 
Expt. 1. -9087 grm. of the substance resulting from Kxpt. I\ . ga^e a lesi ue o 
Ex]S. 2. 0-9209 grm. of the substance resulting from Expt. V. gaie a residue 
” Thfs^co'^^-esponds to a residue on 100 parts of the substance taken-in E.xpt. I ot 
97'16 in Expt. 2. of 97-38 parts. _ n 
witer is given off from the substance during the process, which was co ec e u ^ 
sulphuric acid tube and estimated. It corresponded, in the two experiments o - _ 
and 2-30 per cent. The quantity formed was, however, too small tor correct estmia lon.^ 
these numbers are undoubtedly too high. Traces of probably airborne oxid uio^. 
ing to something under 1 per cent., are also given off. Ihe action is pen c 
The experiment was continued until the substance ceased to lose weight , in 
hours the loss in weight was not above 1 milligramme. 
