4 Colorado Experiment Station 
and character of the min ral constituents, held in solution by these 
waters upon their entrance into that-part of their course which lies 
cutshle of the mountains v rv 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 cours e '1 he composition of the mass of salts had changed 
to even a greater de°r e than the amount of tnem held in solution. 
The read r mav judge for himself how radical these changes aie 
from the following statements of analytical results given in grains per 
imperial gallon :* 
ANALYSES OF CACHE LA POUDRE WATER 
I 
TaRen within the mountains 
Salts 
Grains per 
imperial gal. 
Calcic sulfate. 
Calcic carbonate . 
Magrnesic carbonate . .. • 
Sodic chior id . 
potassic carbonate .... 
Sodic carbonate . 
Sodic silicate ... 
Ferric and Al. oxid. . . • 
Manganic oxid . 
Excess silicic acid.... 
Ignition . 
0.3417 
0.7186 
0.2628 
0.1711 
0.1254 
0.2652 
0.2544 
0.0113 
0.0018 
0.0798 
(0.2678) 
II 
Taken about thirty miles out from 
the mountains 
Salts Grains per 
imperial gal. 
Calcic sulfate . 46.013 
Magnesic sulfate . 36.406 
Potassic sulfate . 0.719 
Sodic sulfate . 6.059 
Sodic chlorid . 4.565 
Sodic carbonate. 14.337 
Sodic silicate. 2.099 
Ferric and Al. oxids. 0.079 
Manganic oxid. Trace 
Excess sodic oxid. 0.096 
Ignition . 4.191 
Total 
2.8999 
Total 
114.504 
SANITARY ANALYSES 
Taken within the mountains 
Taken about thirty miles out from 
the mountains 
Salts 
Tota solids. 
Chlorin . 
Nitrogen as nitrates.. 
Nitrogen as nitrites.. 
Saline ammonia . 
Albuminoidal ammonia 
Oxygen consumed . 
Parts per Million 
.. . 41.4286 
. . . 1.9804 
Trace 
None 
_ 0.0350. 
. . . 0.0900 
_ 2.550 
Parts per Million 
1,635.710 
36.630 
0.400 
0.022 
0.060 
0.160 
1.160 
The total solids contained in this water had been increased ap¬ 
proximately forty times, though it had reached a point only about 3 ° 
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 things 
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, a 
least by name, to the general reader. The scientific man will have no dirri- 
culty in accommodating himself to this mode of statement, even though he 
is accustomed to the really more simple and scientific ionic statement. 
