254 PEOI^SSOE B. C. BEODIE ON THE ATOMC WGHT OE GEAPHIIE. 
U- i. ;i ■ A nt 10(1° contained 13-30 per cent, of barium. Tbe formula C„H,BaOs 
which, dried at iUU , containea ^ t' . p tt -d^q veauii-es 13-73 per cent, 
o/i 1 Q noni nf harium. The formula L 22 -tL? -d^'^io icquutis x j • 
:x::m XhT 1 " — hygroscopic, and when heated explode 
wi “real-iolence than the original body. The compound itself may be termed 
"ThfrSL which is left upon the decomposition by heat of graphic acid although 
par°e site -both by decompoLg the compound, alone, in an atmosphere of nitrogem 
and by de;omposing it mixed with a large quantity of " 
nf ynoLratine the violence of the decomposition, and causmg it to take place at tne io 
foli “ilre. My endeavours were unsuccessful, untU it occur-red to me to effec 
in a Jid medium, by which the pm-Ucles o 
senarated ftom one another and elevation of temperatee precluded The flmd which 
I selected for the experiment was the mixture of hydi-ocarbons of hig o g po s 
W tie llngoon naphtha. It was purified by rectification over sotom and boM at 
about 270° When graphic acid is heated in this fluid, a consideiable quan ) 
late IS formed, which distils over between 100° and 200°, and which is accompanied at 
tot bla light and ultimately by a brisk evolution of gas. This gas was in one expe^ 
lent cllecid and examined: it consisted solely of carbonic acid. But water and 
carbonic acid are not the exclusive products of this reaction. The hydiocarbon becomes 
of a deep red colour, and when filtered and distilled, leaves ablackcaihonaceous «si . 
I have found no means of separating the body formed from the naphtha m which s 
"''^Itoht following experiments the substance was heated in the naphtha for ^^ee or 
fom hlrlat abolt 2^° C., until all perceptible evolution of gas had cease . T 
eranhic acid employed was weighed, and also the residue of its decomposition. 
collected on a weighed filter, washed out with ether and nrth alcohol, and 
dried at 100°. 
Expt. I. 1'024 grm. of graphic acid gave 0-684 grm. of residue. 
Expt. II. 1-0854 grm. of graphic acid gave 0-7248 grm. of residue. 
Expt. III. 2-1805 grms. of graphic acid gave 1-4607 grm. of residue. 
This corresponds to a loss on 100 parts of the substance taken-in Experiment I. ot 
66-78 in Experiment II. of 66-77, in Experiment III. of 66-98 parts. 
These substances, burned in a cui-rent of oxygen, gave the follouung resu s. n 
and all following analyses the residual ash was weighed, and its amoun e uc 
the substance taken. Substance taken. Carbonic acid formed. 
1. Expt. I. . . . 0-311 0-9147 
2. Expt. II. . . . 0-4237 1-2372 
3. Expt. III. . . . 0-3573 1-0404 
4. The same . • 0-3391 0-9857 
Water formed. 
0-0148 
0-022 
0-0178 
0-0185 
