188 
this, that the publication of some chemists are found to be at 
variance in their results, as they were in fact working with 
earbolic acid, while speaking of Kreosote. Hlasiwetz and 
Gorup Besanez, among many others, have now cleared up 
the questions, and brought light and intelligence into the 
many contradictory statements which we find in the literature 
of Kreosote and carbolie acid. We know to-day that two 
homologues are contained in that part of the oil of wood-tar 
which dissolves in caustic potassa, and which bear a certain 
relationship to the compounds obtained from the same part 
of the oil obtained from coal-tar. We are justified in saying, 
that those oils are two distinct and different fluids, for while 
coal-tar oil contains principally 
Phenylic hydrate, C 
Cresylic hydrate, Cc 
woor-tar oil contains :— 
Guajacol, C7 20,;, and 
Kreosol or Homo Guajacol, ©,H,,O.. 
I intended saying here a few words about the place we have 
to assign those compounds in organic chemistry and about 
their constitution, before giving the difference by which one 
class may be distinguished from the other. Phenylic and 
Cresylic hydrate belong to a class of compounds, the radicals 
of which differ by the complex CH’. They are probably 
very numerous, and of those that are known, I will only 
mention— 
Phenyl, C,H; 
Benzyl, C,H, 
oA Briann O1hN 5 he 
The name of Xylylis at present somewhat obsolete, and 
Phloryl is substituted for it. In combination with hydrogen 
those radicals form— 
Phenylic hydride, C,H, or Benzol, 
Cresylic hydride, C,H, or Toluol, 
Phlorylie hydride, C,H,, or Phloruol (Xylo)) ; 
the alcohols of them are— 
Phenylic hydrate, C,H,or Phenol 
Cresylic hydrate, C,H, O or Kresol, 
Phlorylic hydrate, C,H,,0 or Phlorol (Wurtz Xenol). 
In treating these alcohols with oxidizing substances, we 
obtain, at least in the case of Phlorol, substances which con- 
