ee 
, 
i 
eo Pixie 
J.W. Powell's Survey of the Rocky Mountain Region. 449 
that solutions of ammonium compounds can be oxidized to 
nitrites or nitrates by means either of ferric oxide, of black 
oxide of manganese or of gypsum. I can say with Millon,* 
that, in spite of all that has been written in favor of the oxida- 
tion of ammonium by ferric oxide, “I owe it to truth to state 
that though the most varied attempts have been made to oxi- 
ize ammonia in the cold (i. e. in the wet way), by peroxide of 
iron, they have all proved unavailing.” 
I am indebted to my assistant, Mr. D. S. Lewis, for his care- 
ful attention to the details of these experiments. 
Bussey Institution, Jamaica Plain, Mass., April, 1878. 
Art. LXV.—Geographical and Geological Survey of the Rocky 
Mountain Region under the direction of Professor J. W. Powell. 
Account of work performed during the year 1877. 
[Concluded from page 358.] 
was secured. : ) 
vey, prepared a paper on the tribes of Alaska, and edited other 
papers on certain tribes of Oregon and Washington Territory. 
map to accompany his paper, including on it the latest geo- 
1 ination from all available sources. His long 
residence and extended scientific labors in that region pecu- 
liarly fitted him for the task, and he has made a valuable con- 
t f 
The volume also contains a Niskwalli vocabulary with extended 
rammatic notes, the last great work of the lamented author. 
n addition to the map above mentioned and prepared by Mr. 
Dall, a second was made, embracing the western portion of 
Washington Territory and the northern part of Oregon. The 
map includes the latest geographic information, and is colored 
sonian, and turned over to Professor Powell, to be consolidated 
with materials collected by members of bis corps. 
- * Chemical News, 1860, ii, 337, from Comptes Rendus. 
