56 The Colorado Experiment Station. 
help to give a fuller view of the general state of affairs in this 
section. The soil was, of course, strongly impregnated with alkali, 
and judging from the age of the orchard that occupied it, had 
been under cultivation for a number of years, not less than fifteen, 
and probably more than twenty. The water-soluble equalled 6.65 
percent of the air-dried soil. 
ANALYSIS LXIX 
Soil 
laboratory 
No. 588 
Percent 
Sand . 42.745 
Silicic acid (sol.) . 26.526 
Sulfuric acid . 3.187 
Chlorin . 1.799 
Phosphoric acid . 0.111 
Carbonic acid . 1.345 
Lime . 3.634 
Magnesia . 2.032 
Sodic oxid . 4.020 
Potassic oxid . 1.191 
Ferric oxid . 3.792 
Aluminic oxid . 5.483 
Manganic oxid (br.) . 0.113 
Ignition . (4.428) 
Sum . 100.406 
Oxygen equiv. to chlorin . 0.406 
Total . 100.000 
ANALYSIS LXX 
Water- 
Soluble 
Laboratory 
No. 588 
Percent 
Calcic sulfate . 22.550 
Magnesic sulfate . 7.381 
Potassic sulfate . 2.468 
Sodic sulfate . 36.168 
Sodic chlorid . 24.884 
Sodic nitrate . 6.297 
Silicic acid . 0.252 
100.00.0 
It is difficult to see how the drain waters from such a section, 
abounding as this has during the past year in such spots, can fail 
to be comparatively rich in nitrates. Analyses of two drain waters, 
and two seepage water were given in Bulletin 155. The two 
seepage waters were from the base of another mesa, but in this 
general section of country; the two drain waters were from an 
entirely different section of the country but one where similar 
conditions prevailed. We are justified by these facts in assuming 
