on Photogenic or Hydrocarbon-Oils From Coal, 257 
oil [No, 2] offers another hee feature; if after being drawn off and 
distilled, and if in this lis latter process the more volatile or first proceeds, a 
al 
cannot fail to strike he? batibr. inventor was er unfortunate in the 
idea of trying to make at aed ae tithe oil ih gas—in abv orinig to recon- 
cile two ee proce 
‘In 1841 t. 4, Count de ‘Hentiidst of fee specified certain “im- 
given off fame the thick oil. The carbonization is now complete; and I oe 
tain these thre separate oils by the gradual increase of the heat; Aer Te 
this distillation without ¢ deebinposition of the substance, the vapors cane 
from € retort as fast as they are formed. 
The essential oil is separated from the fat oil by exposing he eo 
current of steam m by which the more volatile oil i is carried off. oil rixed] 
— prepared must be = ssharh and is then ready for aplaton i ‘all kinds o 
achine nery, being very fat, works without friction and t. 
The essential oil is collected» te subjected to further theahie 
The specification of Du Buissont for improvement in the oa of bi- 
in nous substances, is an:almost. literal tunlation of Selligue’s las .. me 
Ineo Du Buisson tells us that the extensive works at Autu n, De i eae 
 Saone and Loire, France, are parti property and that ee ee 
management tof them as chemist. He affirms moreover that the most import- 
ant results haye there been attained —results which place the oa ian 
tal of schistus among the most useful and productive of chemica 
actu 
Since we have already e lligue’s specification it is 
~ hee largely from Selligue’s spec 
essary to cite m wG it here. arewe little curious that this most i im- 
(p. in 14)! patent i is not iontiond in Dr. Antisell’s “list of English Pat ents 
cath ‘yt attempts to prepare paraffine and oils from peat§ need not 
be discussed her Anois cell oe mentioned in Dr. A.’s list, is that of 
; SPecifcation No. 9060 of th English Patent Office 
Ina “mem ‘tion d July 5, 1842, de Hompesch claims the 
“tht of distiing oh ~eecicbid ay sige shales, or slates, or other rocks or minerals 
ni June 23, 1845. Specification No. 10,726 of the English Patent Offic. 
pee p. 85 co 5s peictin No, patent dated Jan. 23, 1849. Specifica- 
of the English Patent Office 
"TOUR. SCL—SECOND SERIES, Vor. XXX, No. &9—SEPT., 1860 
33 
