258 Scientific Intelligence. 
These are different phenomena from those displayed hy spongy 
platinum when it forces hydrogen and oxygen to combine. 
Appendix.—Continuation of the investigation at the laboratory 
- a the ide al Mint, London, by the kind permission of Mr. 
ob 
The ae was dried in vacuo over sulphuric acid. It wa 
heated in vacuo by means of a Sprengel pump, when it decomponed 
a the resulting gas was collected over mercur und 
o have twenty-s even times the volume of the felsial solid 
Abulpue of the gas proved it to contain nitrogen and hydrogen. 
The results of a further examination will shortly be given.—Phil. 
ag., 1V, xxxviii, 58. June 23, 1869. 
Ld 
II]. MINERALOGY AND GEOLOGY. 
a chal Field Report of the U.S. Geological Survey of 
Colorado and exico, conducted, under the rs ee a ae: we 
explorations, however, were continued farther west, to an among 
ley, through the South Park to Denver again. Prof. Hayden re 
marks that “the coal formation along the base of the mountains 
was studied with great epee | ith these coal beds are asso 
ciated valuable deposits of bro n ore. The coal and iron de- 
posits of the Raton Hills ettend from the Spanish Peaks to Max- 
well’s ~~ the supply of both is quite inexhaustible and of excel- 
lent qual ity. The future influence of these two important minerals 
o¢ality, on the success of a Pacific Railroad, cannot be 
Meeeetsiantens It is believed that the coal and iron mines of the 
Sabon Hills will be of far more value to the country than all the 
mines of sear metals in that district 
The next locality for coal was at the Placiere Mountains. 
now a true oe 
_ As this Report consists of field —_ the geological ft 
_ ‘present at oe Pp — and we 
222 eee eaten cama 
