56 BULLETIN 82 . 
TABLE XLVI.-ANALYSIS OF PLATTE RIVER WATER, SAM¬ 
PLE TAKEN ONE MILE SOUTH AND FOUR EAST 
OF GREELEY, AUGUST 11, 1902. 
Ors. 
Grs. 
Analytical 
Per 
Imp. 
Per 
Imp. 
Results. 
Cent. 
Gal. 
Combined 
Cent. 
Gal. 
Silicic Acid. ... . 
. 1.214 
0.891 
Calcic Sulfate_ 
43.651 
32.040 
Sulfuric Acid_ 
_ 44.416 
32.601 
Magnesic Sulfate 
22.504 
16.518 
Carbonic Acid.. _ 
_ 6.205 
4.554 
Potassic Sulfate ._. 
0.892 
0.655 
Chlorin . 
_ 3.653 
2.681 
Sodic Sulfate_ . 
5.959 
4.374 
Sodic Oxid ... _ 
. 15.617 
11.463 
Sodic Chlorid_ 
6.028 
4.425 
Potassic Oxid _. 
. 0.483 
0.355 
Sodic Carbonate . 
14.962 
10.982 
Calcic Oxid . _ 
. 17.966 
13.117 
Sodic Silicate__ 
2.087 
1.532 
Magnesic Oxid.. 
. 7.535 
5.530 
Ferric and Al. Oxids 
0.257 
0.189 
Ferric and Al. Oxids 0 257 
0.189 
Manganic Oxid. _ _ 
0.257 
0.189 
Manganic Oxid __ 
0.257 
0.189 
Ignition __ 
3.266 
2.397 
Ignition _ _ _ 
3.266 
2.397 
Sum __ _ 
99.863 
73.301 
Sum ... _ 
.100.869 
73.967 
Excess Silicic Acid 
0.124 
0.091 
Oxygen Eq. to Cl.. 
_ 0.823 
0.604 
Total .. 
99.987 
73.392 
Total_ 
.100.046 
73.372 
Total solids. 
73.4 grains 
per Imperial gallon. 
SANITARY 
ANALYSIS. 
Parts Per Million. 
Parts Per Million. 
Total Solids.. __ 
_1,048.570 
Saline Ammonia_ 
0.020 
Chlorin 
42.590 
Albuminoidal Ammonia.. 
0.150 
Nitrogen as Nitrates 
0.400 
Oxygen consumed.. 
0.994 
Nitrogen as Nitrites 
0.015 
§ 103. The samples of Poudre water were taken at points at 
least seven miles apart ds the river flows. The water on this date 
was not only representative of return water, but was wholly such 
as had come into the river within the last few miles above these 
points. The water taken at the lower point had, for the greater 
part, returned within the last seven miles. This fact may account 
for the differences presented by the analyses. There is no reason 
for any one to stumble over, or raise any question about, the manner 
of combining these salts, for the variations which can be shown in 
this way have no weight in the larger features presented by these 
results. 
§ 104. The three principal salts in these waters are, in the 
order of their relative quantities, calcic sulfate, magnesic sulfate 
and sodic carbonate. The sulfate of soda present in such notable 
quantities in the ground waters, and still more so in nearly all of 
the efflorescences, is very subordinate or absent. The potassic oxid 
is present in a slightly higher percentage than the average found 
for our ground waters, but the total solids is very much less. 
§ 105. The sanitary analyses show that in total nitrogen the 
return waters are not so unlike the ground waters as one would 
expect, as they resemble those taken before irrigation quite close¬ 
ly. The only exception being the Arkansas river water, taken at 
Rockyford, in which we found large quantities of both nitrates and 
nitrites. I know much less about the conditions obtaining in re- 
