196 INVESTIGATIONS CONCERNING CREOSOTE. 
notwithstanding the difference of composition. The hydro- 
guret of guaiacyle (C 28 R} 6 t O 4 ) may be regarded as an oxide 
of creosote, (C 28 HIE 2 =2 volumes of vapor.) 
Creosote colors blue a great quantity of water containing a 
trace of a salt of peroxide of iron ; with the hydroguret of 
guaiacyle, the coloration is brown. Creosote represents, by 
its composition, alcohol of the benzoic series. Bromine gives 
a crystallized acid with creosote, half of whose [hydrogen is 
replaced by bromine, equivalent for equivalent. 
Hydroguret of guaiacyle and creosote, treated by sulphuric 
acid and chromate of potassa, give rise to a salt of chromium 
analogous to tartrochromic acid. From the acid produced 
with creosote I extract a resin, which appears to me very in- 
teresting for the verification of the hypothesis on which I found 
the formation of creosote in the distillation of wood. 
Absolutely pure creosote is not colored in the air. It com- 
bines with alkalis and bases, as Reichenbach observed, and 
its solution is colored blue by the salts of iron. All these pro- 
perties render it similar to hydroguret of salicyle, beside which 
it may perhaps be placed by doubling its formula. 
The Chemist, from Comptes Rendus. 
