Chemistry and Physics. 59 
SCIENTIFIC INTELLIGENCE. 
I. CHEMISTRY AND Puysics. 
_ 1. Acetylene and its Determination.—BuiocuMaNnn has sub- 
jected the metallic compounds of acetylene to exact analysis and 
derives the formula C,H,Cu,O for the copper salt, either 
on h>Cu, +H, 0; 
re (Cu, OH) or ie U, et! 
and the similar formula C,H,Ag,O for the silver compound. 
Its formation is thus given: 
Cu,Cl,(NH,),+H,0+C,H,=C,H,Cu,0+(NH,Cl),, 
and its decomposition by acids thus : 
C,H,Cu,0+(HCl),=C,H, +Cu,Cl,+H,0. 
The acetylene used for the preparation of these compounds was 
deta from ethylene bromide by treatment with alcoholic potash, 
way, ten liters being drawn through the solution, afforded in 
two parallel determinations :063 and -064 per cent of acetylene 
e production of acetylene by a Bunsen burner 
u at the bottom of its tube was noticed by Rieth. The 
author finds that a gas, which gave in its combustion-product 
Ww urned as usual in such a burner 0°120", or -08 per cent by 
volume of acetylene, afforded when b low, by ordinary 
f4sometric analysis 0°96, and by the copper method 0°80 per cent 
of eh ng by volume, twelve times the original quantity.— Ber. 
Berl. Chem, Ges., vii, 274, March, 1874. G. F. 
2. On Eucalyptol.—Fausr and Homeryer have critically ex- 
amined thejhydrocarbon called eucalyptol by Cloez, which consti- 
tutes the principal portion of the ethereal oil of Eucalyptus glo- 
t was prepared by fractional distillation from this oil, 
three kilograms yielding 600 grams, boiling between 174° and 
