IOWA ACADEMY OF SCIENCES. 
135 
The analyses recorded below were made by Mr. Saylor. 
The analysis of the Missouri river water was made from 
the clear water after the sediment had settled, and the 
sample was obtained at the combination bridge. It was, 
therefore, unco^taminated with Sioux City sewage. Both 
samples of water were obtained in November and Decem- 
ber, 1904. The ice was from the crop of 1903. 
I 
Sioux 
River 
Ice. 
Missouri 
River. 
Sioux 
River . 
Total solids 
127 
493.5 
642 
7.46 
Chlorides 
7.14 
14.49 
Nitrogen as nitrates 
.025 
.857 
1.57 
Nitrogen as nitrites 
None. 
Trace . 
None . 
Nitrogen as free ammonia 
.2196 
051 
.293 
Nitrogen as albuminoid ammonia 
.153 
.1407 
.056 
Oxygen consuming power 
2.13 
4.225 
2.13 
Other analyses of Sioux City waters have been made 
during the year but are not available for publication. 
Note. — The analysis on page 123, vol. X, which is reported as manu- 
factured ice, is Sioux river ice. 
A NEW DEPOSIT OF FULLER’S EARTH. 
BY ALFRED N. COOK. 
A few months since a prospector brought me a specimen 
of earth of uncommon appearance from the Black Hills of 
South Dakota for analysis with the hope that it might 
be something of value. It proved to be Fuller’s 
earth of exceptional quality and I considered the result 
of sufficient interest to be published. Below is given 
the result of the analysis of the specimen dried in the air 
for two years. Two other analyses from the literature 
available are given for the sake of comparison. The per 
