4 
Colorado Experiment Station 
and character of the mineral constituents, held in solution by these 
waters upon their entrance into that part of their course which lies 
outside of the mountains very definite and showed that these changes 
were radical. The total solids increased from 2.9 and 2 : ,6 grains per 
imperial gallon in samples taken within the mountain section of its 
course, to 114.5 grains in; a sample taken perhaps thirty miles further 
down its course. The composition of the mass of salts had changed 
to even a greater degree than the amount of them held in solution. 
The reader may judge for himself how radical these changes are 
from the following statements of analytical results given in grains per 
imperial gallon :* 
ANALYSES OF CACHE LA POUDRE WATER 
I II 
Taken within the mountains Taken about thirty miles out from 
the mountains 
Salts 
Grains per 
Salts 
Grains per 
imperial gal. 
imperial gal. 
Calcic sulfate. 
0.3417 
Calcic sulfate . 
. . . 46.013 
Calcic carbonate . 
0.7186 
Magnesic sulfate . . . . 
. . . 36.406 
Magnesic carbonate ... 
0.2628 
Potassic sulfate . 
0.719 
Sodic chlorid . 
0.1711 
Sodic sulfate . 
6.059 
Potassic carbonate . . . 
0.1254 
Sodic chlorid . 
4.565 
Sodic carbonate . 
0.2652 
Sodic carbonate. 
... 14.337 
Sodic silicate . 
0.2544 
Sodic silicate. 
2.099 
Ferric and Al. oxid... 
0.0113 
Ferric and Al. oxids. . 
0.079 
Manganic oxid . 
0.0018 
Manganic oxid. 
Excess silicic acid..., 
0.0798 
Excess sodic oxid . . . . 
0.096 
Ignition . 
. (0.2678) 
Ignition . 
4.191 
Total . 
2.8999 
Total . 
... 114.504 
SANITARY 
ANALYSES 
Taken within the 
mountains 
Taken about thirty miles out from 
the mountains 
Salts 
Parts per Million Parts per 
Million 
Tota solids. 
. 41.4286 
1,635.710 
Chlorin . 
. 1.9804 
36.630 
Nitrogen as nitrates.. 
. Trace 
0.400 
Nitrogen as nitrites.. 
. None 
0.022 
Saline ammonia . 
. 0.0350 
0.060 
Albuminoidal ammonia 
. 0.0900 
0.160 
Oxygen consumed . 
. 2.550 
1.160 
The total solids contained in this water had been increased ap¬ 
proximately forty times, though it had reached a point only about 30 
miles beyond the mountains. The carbonates which predominated in 
the mountain water have disappeared, with the exception of sodic 
*1 retain this old form of statement because I believe it to be, all thing's 
considered, more easily apprehended by the general reader than other forms 
often used. The imperial gallon, being an even ten pounds, is a convenient 
measure and the hypothetical compounds are, for the most part, familiar, at 
least by name, to the general reader. The scientific man will have no diffi¬ 
culty in accommodating himself to this mode of statement, even though he 
is accustomed to the really more simple and scientific ionic statement. 
