iF. V. Hayden on the Geology, &c. 229 
ever, Gmelin describes a salt to which he gives the formula 
bO, NO, Aq,* and we express the composition of these salts 
quite as well, by writing them thus, 
KONO, CoONO, or 
KONO,, or PbhONO,+HO 
This subject will be pursued, and I hope to get several other 
salts, which must give some reactions that will lead to the right 
rational formule. 
Heidelberg, Baden, Dec. 5th, 1860. 
waters of the Missouri and Yellow Stone Rivers; by Dr. i 
HAYDEN, Geologist to Capt. Raynolds’s Expedition, with an 
Introductory letter by Capt. W. F. Raynolds, U.S. Topograph- 
ical Engr. 
Arr. XXI.—Sketch of the Geology of the Country about the oe 
. ue 
A. Capt. Raynoups’s Lerrer. 
Honorable Seeretary of War. 
The district that was examined by the expedition is bounded by the 
country was such as to foree my division of the party across the main 
chain of the mountains. 
The expedition was in the field for two entire seasons (1859 and 1860) 
and during about half of the first and the whole of the last season, was 
divided into two sections or divisions, the first under my immediate con- 
Cénting tra ¢ m ast fift twenty years. 
D § trappers and not by them for the past fifteen or twenty 5 ie Platte, 
* Hayden made a geological examination of the country to the south- 
ward along the base of the tain chain to near Pike’s Peak. 
* Handbuch, Bd. 8, s. 142. 
Aw Jour. Sct.—Szcoxp Sens, VoL. XXXI, No. 92—Mazos, 1861 
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