on Photogenic or Hydrocarbon-Oils from Coal. 259 
Let it be Sh understood that we would in no wise detract from the 
real nae 8 Mr. er _ Unitin , as he does, no cout share of Page 
sc 
ulted. ell on e 
blame for his incorrect and part rtial “history.” W en ginny! (on p. 14), 
Dr. A. tells us that: “only since the year 1850 has the ee of paraf- 
from pit-coal, turf and ities min ous shales succeeded as an art. The 
of Ja 
100 parts of Cannel-coal 40 per cent of ‘all a nd 10 per cent t of paraffine could 
be obtained.” He makes a statemen re is grossly exagge OAc not 
t wa r 
from coals by distillation. He claimed the Rey uction of paraffine oils— 
the production of bay eis or pa [benzol sat nor naphthalin, but paraffine 
and its congeners: this involves the slower distillation of coals at a lower 
abet than had bain: athens effected, and this novelty in practice was 
e 
it means an thing—that in the opinion of Dr. A., oung was the first 
person who distilled coal fon manufacturing scale 2 at Sage Spek hh = low 
temperatures. What Dr. Antsel's Rabe Bie er g “low tempera- 
tu Pri - “ practic ic al” ma be, t we do know that when 
: ad | exer ised the greatest ca re in maintaining the temperature of his r 
at ; 
para: 
ll this however does n & spent to satisfy Dr. A i ig! ‘gets wee sh 
fa il fr 
the soya ie 52 inggah , hn : n fit to dwell at gn 
‘ it here. 
a aay ie the term “coal” is applied i in common language to a great 
nety of mineral sone bles no wes kinds of which are eer sae alike 
or’ ‘ke others. The term is at 
Conventional ; used, in lack of any better one, to designate substances wi 
the real nature of which we are still almost entirely ignoran 
ined in such quantities as 
now being discovered, 
and this « a or coal being disco pie which is of very wich quality, and having a 
; pion a is the essential pat 2 : peg : | 
taining paraffine righ sa. a eee shou yur panda Si gh put in Lary 
“cause it woul i 1d. be put into pr , 
begs a irae sub =n as rs “ Chimie I Al operate” 
to “lly P eas9 until then I do not find it was obtai 
