‘Geology and Natural History. 313 
And finally, by the action of water produced in the last reaction, 
the tetrachlorinated ether produces chloral and alcohol: 
(4) CCl,---CH Ors 4 1,0= HC1+C,H, (OH)+CCl,-.-COH, 
or, by the action of alcohol, produces trichloracetal,—a substance 
| detected by Lieben in the products of the chloral manu- 
acture, 
mM water is neutral and tastes sweetish. Treated with silver oxide, 
it yields free dulcitamine, as a powerful base, easily displacing 
ammonia from its combinations, bluing strongly red litmus 
Water and alcohol. Dulcitamine has the formula C,H,,NO,, an 
resembles glyceramine in many of its properties. Its discovery 
furnishes new proof of the close relations between the triatomic 
alcohol, glycerin, and the hexatomic alcohol, dulcite—C. &., 
Ixxiv, 1406, May, 1872, G F. B 
Il. Grotoagy AND Natura History. 
1. Hayden Rocky Mountain Geological Expedition.—(From 
4 letter by Dr. F. V. Haypen, in charge of the Expedition, to 
J.D. Dana, dated Madison Valley, Montana Territory, Sept. 1, 
1872.)—The following is a brief summary of what the survey under 
my charge has accomplished up to the present time, and what it 
Proposes to do before the end of the season. 
rge and well-equipped parties have been in the field at 
y uly. The largest party made Ogden 
the point of departure. It was under the direction of Mr. James 
tevenson, my principal assistant. There are attached to this 
