OF THE DESTEUCTIVE DISTILLATION OF BOOHEAD COAL. 
743 
On redistilling the hydrocarbon, fractions were obtained from 82° to 104°. They were 
analysed as follows : — 
I. -1390 gramme gave -4366 carbonic acid and '1785 water. 
II. *1667 gramme gave ‘5254 carbonic acid and ’2161 water. 
III. •1532 gramme gave ‘4800 carbonic acid and '1953 water. 
IV. -1862 gramme gave -5850 carbonic acid and -2348 water. 
Or, per cent. — 
I. 
II. 
III. 
IV. 
Mean. 
Theory C”H«. 
Carbon 
. . 85-7 
86-0 
85-5 
85-7 
85-7 
85-7 
Hydrogen 
. . 14-3 
14-4 
14-2 
14-0 
14-2 
14-3 
The first of these analyses was made on a fiuid boiling at 85°, the second and third at 
90°, and the fourth at 99°. In order to find the value of the vapour-density of each 
of these fractions was determined by Gay-Lussac’s method. 
Boiling- 
point. 
Weight of 
liquid. 
Volume of 
vapour. 
Difference 
of level. 
Barometer. 
Temperature 
of vapour. 
Pressing col. 
of oil in mm. 
of mercury. 
Density. 
O 
85 
0-0977 
35-75 
87-3 
755-1 
100 
21-7 
3-19 
90 
0-1292 
47-50 
36-0 
732-5 
121 
20-3 
3-22 
99 
0-1117 
43-25 
55-0 
742-0 
146 
21-0 
3-32 
The fraction boiling at 99° has therefore the composition and condensation of oenan- 
thylene or heptylene, the olefiant gas of the oenanthylic alcohol, which requires the 
following numbers : — 
14 volumes of carbon-vapour=0'8290 X 14=11‘6060 
28 volumes of hydrogen =0’0692x28= 1’9376 
13-5436 
4 
3-3859 
The specific gra\ity of heptylene, in the fluid state, was 0-7184 at 17° 
From these results it is e\ident that the products of the action of sodium do not vary 
with the temperature. They also fully confirm the statement, made in another part of 
this paper, to the effect that the hydrocarbons produced by the processes detailed are 
identical with those existing in the Boghead naphtha. It will be remembered that the 
naphtha, from which the bromine compound yielding the heptylene was obtained, boiled 
between 82° and 88°, and the hydrocarbon produced by the action of sodium on the 
bromine compound came over between 85° and 99°. 
The decomposition which the bromine compound undergoes is by no means simple, 
large quantities of difficultly combustible charcoal separating, with production of small 
but distinct traces of fatty acids. 
Little is known with regard to the true boiling-points of the C" H” series. Those 
which have been most examined, and consequently appear best adapted for standards 
with which to compare the boiling-points of the other homologues, do not agree with 
