Nitrogen Fixation 
29 
- ANALYSIS XXVI. 
ANALYSIS OF SHALE. Laboratory No. 645. 
Per Cent. 
Carbon . 1.587 
Silicic acid . 47.292 
Sulfuric acid . 1.457 
Carbonic acid . 11.466 
Chlorin . 0.053 
Titanic acid . 0.500 
Calcic oxid . 16.129 
Magnesic oxid . 2.271 
Potassic oxid . 2.389 
Sodic oxid . 2.884 
Ferric oxid . 4.052 
Aluminic oxid . 7.9 5 7 
Water at 108°. 1.699 
Water at 200° . 0.656 
100.392 
This shale is fossiliferous, is low in silicic acid and carries a 
large amount of lime, but no organic matter or other source of 
nitric acid. 
We have presented by a considerable number of samples, the 
question of the nitrates in the soil, in the ground waters and in 
some of our seepage waters. There yet remains the question of 
our drain waters. We have but two of these to present. One is 
from a water course constituting the natural drainage of the section 
in which it is located, the second is from a box drain laid 4^2 feet 
deep. 
The water course constitutes what is locally called a “wash.” 
The sample was collected in October, 1907, and was made up of 
a mixture of water from the irrigating canal, of off flow water 
from irrigated fields, and of seepage or drain water. The total 
solids were 359.52 grains per imperial gallon or 5,164.5 parts per 
million; ignition expelled 115.08 grains. This wash runs through 
the first mesa counting from the river and the mesa back of this 
has not yet been brought under irrigation. The depth of soil over 
the shale is not great, in some places it is very shallow. 
ANALYSIS XXVII. 
RESIDUE FROM WASTE WATER. Laboratory No. 605. 
Per Cent. 
Calcic Sulfate . 20.283 
Magnesic Sulfate . 33.573 
Sodic Sulfate . 20.749 
Sodic Carbonate . 5.351 
Sodic Chlorid . 8.528 
Sodic Nitrate . 4.159 
Sodic Silicate .;. 0.631 
Sodic oxid (excess) . 0.161 
Loss (water, organic matter, etc.) . 5.346 
100.000 
