OF THE DESTEUCTIVE DISTILLATION OE BOGHEAD COAL. 
455 
Carbon . . 
Hydrogen . 
Experiment. 
A. 
r 
I. 
II. III. 
IV. 
84-1 
84-2 84-0 
83-9 
15-7 
15-7 
15-9 
Mean. 
Calculation. 

84-1 
C 16 
96 
84-2 
15-8 
H18 
■ 18 
15-8 
114 
100-0 
The fourth analysis was made upon a different preparation to the others. 
Kolbe’s radical obtained by the electrolysis of butyric acid gave him the following 
numbers, which are sensibly the same as the above : — 
Kolbe. 
r" s 
Carbon .... 84T 84-0 
Hydrogen . . . 15-9 15’8 
Annexed is a determination of the vapour-density of the fraction distilling between 
116'’ and 121°. 
Excess of weight of balloon . -5270 grm. 
Temperature of vapom* , . 167° 
Temperature of air . . . . 16° 
Pressure . . . . ‘ . . . 753 mm. 
Capacity of balloon . . . 280 cub. cent. 
Residual air 1*0 cub. cent. 
The formula C*® H‘® requires — 
16 volumes carbon vapour. 
36 volumes hydrogen . . 
0-8290. 16=13-264 
0-0692.36= 2-491 
15-755 
4 
3-9387 
Experiment. Kolbe. Wtjbtz. Theory=4 vols. 
3-883 4-053 4-070 3-9387 
Although the above numbers are exceedingly near those required by theory, it follows 
that the boding-point of the hychocarbon having the same formula as butyle from Bog- 
head coal, is decidedly higher than that found by Kolbe and Wuetz. The boiling- 
point of Kolbe’s hydrocarbon, obtained by electrolysis of valerianic acid, was 108°, and 
that of butyle, obtained by Wuetz by cohobating iodide of butyle over sodium, was 106°, 
whereas my hydrocarbon distilled in the sixteenth rectification between 116° and 121°. 
It will be seen that in the first and third analysis there is a tendency towards a defi- 
ciency in the hydrogen ; on searching into the cause of this, it was found that a trace of 
one of the homologues of olefiant gas, to be described in the second part of this paper, 
remained in the fluid. This arose from insufficient treatment with nitric acid. The 
fourth analysis was made on a perfectly pure product. The results obtained further on 
with the other radicals are perfectly in accordance with those of other chemists. The 
density of the butyle, as analysed, was found to be 0-6945 at 18°, agreeing perfectly 
