RESEARCH FOR ARSENIC AND ANTIMONY. 
229 
popular opinion there, rabies only occurs among the domes¬ 
ticated dogs, while the wandering dogs, which are numbered 
by thousands in that city, never become the subjects of the 
disease.] —Lancet and Medical Times. 
PETROLEUM SPRINGS IN NORTH AMERICA. 
Dr. A. Gesner states that 50,000 gallons of mineral oil 
are daily raised from these springs for home use and expor¬ 
tation. 
The oil-region comprises parts of Lower and Upper 
Canada, Ohio, Pennsylvania, Kentucky, Virginia, Tennessee, 
Arkansas, Texas, New Mexico, and California. It reaches 
from the 65th to the 123th degree of longitude west of 
Greenwich. The latest account of those in Canada states 
that they are continuing to yield abundantly, and, contrary 
to theories at first propounded, the deeper the wells are sunk 
the better the yield and the richer the oil. The extent of 
surface embraced in the oil districts is much larger than was 
at first anticipated. Villages are rapidly springing up, re¬ 
fineries are being built, and roads constructed. Many large 
establishments throughout the country are using rock oil in 
place of gas, and find it much cheaper, and in some instances 
it gives a better light. 
FACTS AND FALLACIES CONNECTED WITH THE RESEARCH 
FOR ARSENIC AND ANTIMONY; WITH SUGGESTIONS FOR 
A METHOD OF SEPARATING THESE POISONS FROM 
ORGANIC MATTER. 
By Alfred S. Taylor, M.D., F.R.S. 
(Concluded from vol. xxxiv, p. 679.) 
8. Metals and metallic salts .—The detection of arsenic in 
such metals as copper, iron, or lead, is effected by distillation 
with hydrochloric acid, after their conversion to chlorides. 
This method has been already fully described in reference to 
copper (p. 413). In July and August, 1859,1 first employed it 
for the detection of arsenic in sulphate and insoluble oxy¬ 
chloride and arsenite of copper, as well as in chloride ot tin, the 
subnitrate of bismuth, and gray powder. In ten grains ol the 
sulphate of copper supplied from the shop of a medical prac- 
