Rocky Mountains and Oregon. 199 
were numerous; but, as far as we could ascertain, were entirely confi- 
ned to that locality in the bottom. In the bed of the river, in front, for 
a space of several hundred yards, they were very abundant; the ef- 
fervescing gas rising up and agitating the water in countless bubbling 
columns. In the vicinity around were numerous springs of an entirely 
different and equally marked mineral character. In a rather picturesque 
spot, about 1,300 yards below our encampment, and immediately on 
attained only at regular intervals, according to the action of the force 
below. ni 
years 
servation, that smelling the gas which issued from the orifice produced 
a sensation of giddiness and nausea. Mr. Preuss and myself repeated 
the green trees near, make this a picturesque Spot. 
“A short distance above the spring, and near the foot of the same 
pur, is a very remarkable yellow-colored rock, soft and friable, con- 
Sisting principally of carbonate of lime Se be of iron, of regular 
‘etaiieg er ees cant Re Fog ee 
_* Carbonate of lime 92:55, carbonate of magnesia 0-42, oxyd of iron 1-05, silica, 
alumina, water and loss, 5-98 = 100-00. 
