744 
ON THE DESTEUCTIYE DISTILLATION OE BOGHEAD COAL. 
each other. The boiling-point of amylene, according to Feankland, is 35°; that of 
octylene was determined by Cahoues to be 108°, while Boris found it 125°. For con- 
venience of reference the following Table is appended, sho^Ting some of the physical 
properties of the best-known members of the C" H” family. 
Table of the Physical Properties of some of the C" H” series. 
Observer. 
Formula. 
Boiling. 
Density. 
Density of vapour. 
point. 
Experiment. 
Theory. 
Amylene 
Hexylene 
Hexvlene 
Frankland. 
Fremv* * * § . 
C. G. Williams. 
CIO ^10 
C12 
C12 
O 
35 
55 
71 
99 

2*386 
2*875 
3*020 
2*422 
2*904 
2*904 
3*386 
Heptylene 
C. G. Williams. 
CU HU 
0*718 at 17° 
3*320 
Octylene 
Bouisf. 
C16 
125 
0*723 at 17° 
3*900 
3*8i 5 
Octylene 
Cahours 
C16 H'o 
108 
0*708 
3*920 
3*875 
Nonylene 
Fremy*. 
C 18 H's 
110 
4*488 
4*359 
It results from the experiments detailed in the first and second parts of this investiga- 
tion, that Boghead naphtha consists of a mixture of hydrocarbons belonging to ^ three 
series, namely, — 
The radicals of the alcohols. 
Homologues of benzole. 
Homologues of olefiant gas. 
APPENDIX. 
Since the reading of the above, I have seen some experiments recently published by 
Limpeicht on the action of perchloride of phosphorus on oenanthole^. He finds the 
product to be chloride of cenanthylene, 0^“ FI‘^ CP. By treatment with sodium he 
obtains cenanthylene (heptylene), boiling at 95°. By first treating the chloride with 
alcoholic potash to obtain C‘^ Cl, and then with sodium, he expected, as I did, 
to obtain C'^ or rather (for 4 volumes of vapour) C^® The resulting fliud, how- 
ever, boiled at 95°, and had all the properties of heptylene. One not very satisfactory 
analysis agreed better with C'* than C’"* H‘^, but he admits that the properties of 
the hydrocarbon agreed so exactly with cenanthylene, that he could not insist on the 
accuracy of C’"* as the true formula. My experiments, by proHiig the regeneration 
of cenanthylene by the action of sodium on C'^ H*® Br, show the true natime of M. 
Iampeicht’s result. M. Limpeicht states C*^ H'® Cl to be without action on sodium at 
ordinary temperatures ; this difference between the chlorine and bromuie compoimds is 
curious and worthy of examination. 
* By distillation of hydroleic and inetoleic acids. 
t By action of sulphuric acid on octylic alcohol. 
J By distilling pelai’gonic acid with potash-hme. 
§ Chemical Gazette, March 15th 1858. 
