. 
on Photogenic or Hydrocarbon-Oils from Coal. 255 
The oil Pesaryes less odorous and less highly colored after each such 
“cold oh enti 
hav ing been allowed to separate from the lye, the oil is decanted off; 
if it has not lost much of its color the process has been badly conducted. It 
should be stated that the oil must not be agitated sever times with the pt 
for, by so doing, the dark color of the oil would be restored, * 
for the residues of the soda treatm tment, continues Selligue, they s ie Id ‘ei 
allowed to stand at rest during some days beneath a portion of oil, which will 
made, or y adding water, grease may be separated. This grease is similar to 
that used seated wagons. 
rm treatment which follows the cold, and consists of a series o 
serge dstillations,—specia cnerations for the purification of the “ light- 
” being resorted to. For e details of these we must refer to the 
bbe ated. 
imbibition, but this occasions a great loss of oil and also requires more labor. 
With this specification the scientific titen a of the subject by Selligue 
appears to have ceased, yet in the same year he replies} to a note ening tnt 
g oan 
arsenic can be found in the roducts from his own es’ men 
describes the locality and ppileliee position of his shale, the method of distil- 
lation em mployed,—how the temperature is gradually elevated, &c. 
This | 1s of interest as showin ng that the manufacture of coal-oil in France 
Was no ephemeral fancy, but for m any years was a well established ‘branch of 
TO- 
is 
duets of the prullaton of bituminous eng of Bain Serres should also be 
on ligu 
aie yi very i in teresting article upon wasted 
urdes, b A. Mallet ( in ‘Lowe e’s Dictionnaire des Arts et Manu- 
fretures, 24 Ed., Paris, a in which Setigue’ 1 8 processes are incidentally 
igi tolerably accurate English translation of this important patent may be 
of then, he specification of M. A. B, B Du Buisson, 1845; specification No. 10,726 
the English Patent Offic 
R Ibid, xx 
Comptes Rendus be ba 239 i Sg iy tt ive lili, 263. 
ion, xxviii, 91, * Ibid, 
tt A t big, Z rs for the aaa me only to the 
ate epedt ra thie arti i, whi dea aoe Gl y be obtained in a way 
18 also contained in Dingler’s Polytechnisches _ s 1847, cvi, 128, 
