TABLE OF CONTENTS 
Section. 
1. Subjects treated of in preceding parts of 
this bulletin. 
2. The alkali question in Colorado. 
3. The effects of over irrigation. 
4. The presence of a hard pan sometimes the 
cause of alkalization. 
5-6. Conditions of plot experimented with, 
reasons for choice of plot. 
8. Object of bulletin stated. 
10. Crops grown sensitive to lack of water. 
11. Heights of wells A B, etc., above reference 
plane. Location of wells A, B, C and D 
The water plane higher at west end of 
plot. Inclination of surface greater than 
that of water plane 
12. Drainage of the plot 
13. Changes in height of water plane affected 
by meteorological conditions. Water 
plane depressed by rainfall. Duration 
of effects of rainfall upon height of water 
plane. 
15. Effects of the freezing and thawing of the 
soil on height of water plane 
16. Influence of town ditch on height of water 
plane. 
17. The filling of the town ditch caused de¬ 
crease in total solids and chlorin in 
ground water Total solids and chlorin 
decreased by filling of town ditch. 
19. Rate of fall in height of water plane. No 
free drainage from east end of plot. 
20. Difference between rise of water plane due 
to capillarity and irrigation. 
21. Other oscillations in height of water plane. 
22. Plot favorable to the study of the charac¬ 
ter of the salts in ground water * 
23. Amount of total solids in different wells 
not the same. 
24. The rise and fall in the water plane an up 
and down movement of the water. 
25. No lateral movement of water detected. 
26. Falling water plane leaves salts in soil. 
27-28. Increase in total solids due to irriga¬ 
tion irregular. 
29. Duration of the effect of irrigation on the 
amount of total solids. Minima and 
maxima for total solids in wells—1897. 
30. Well B richest in total solids. 
31. Increase of total solid in wells B and D 
with a falling water plane, while they 
decreased in wells A and C, attributed to 
conditions of diffusion. 
33. Meteorological conditions and height of 
water plane, spring of 1898. 
34. Exceptional amount of total solids in 
water, May 16. 
36. Amount of water necessary to cause change 
in height of water plane not determined. 
37. Light rains during wet periods do not 
cause rise of water plane 
38. Total solids in wells a and C exceptionally 
high. 
39-40. Effect of 1.82 inch rainfall on height of 
water table and total solids 
45. The height of water in wells and soil the 
same. 
46. Total solids less in the well waters than in 
soil water. 
47. Effect of drain on amount of total solids in 
well waters. Radius of influence of wells 
upon salts in soil probably small. 
48. Translocation of salts through soil im¬ 
probable. 
49. The water in the wells possib’y a mixture. 
50. Decrease of total solids with fad of water 
table explained. 
51. The waters in the wells probably not mix¬ 
tures 
52. The stratum of gravel underlying the plot 
not necessarily course of flow. 
53. Soluble salts eliminated by cultivation. 
56. Ratio of salt, sodic chlorid, to total solids. 
Variation in quantity of salt present not 
same as variation of total solids. 
57. Chlorin present no measure of total solids 
present. 
Section. 
58. Chlorin in ground water diminishes with 
depth. 
60. Chlorin in ground water increased by irri¬ 
gation. 
61. Chlorin in ground water does not show the- 
movement of the alkali salts in the soil. 
62. Total solids defined 
64. Well waters represent the average free solu¬ 
tion iu the soil. 
69. Method of combining analytical results. 
Method of combining results of analyses 
not always correct. 
70. Excess of sodic oxid in analyses. Excess 
of sodic oxid higher when organic mat¬ 
ter is higher. 
74. Surface well waters. 
78. Composition of total solids throughout ex 
periment. 
82. Individual samp es of water or soil not 
representative. 
86. Composition of alkali crust. 
87. Differences between alkali crusts and water 
soluble in soil Silicates in water and 
soluble of soil. Potassic salts in alkali 
crusts. 
88. Characteristics of water-solub'e portion of 
soil. 
90. Percentage sodic sulfate in alkali crusts, 
ground water, etc. 
91. Double sodic-magnesic sulfate probably not 
formed. 
93. Presence of magnesic and sodic sulfates in 
incrustations accounted for. 
94. Drain water not rich in sodic sulfate. 
95. Lower portions of ground water poorer 
than upper. Grouud water and drain 
water different. 
98 Lithia in the ground water. Litliia in ash 
of beets and beet leaves 
97. Nitric acid in air dry soil; first two 
inches. 
98. Nitric acid in a’r dry soil: second two- 
inches. 
99. Nitric acid in ground water. 1897. 
100. Nitric acid in ground water. 1898. Effect 
of irrigation on nitric acid in ground 
water. 
101. Duration of effects of irrigation on nitric 
acid. 
102. Rate of decrease in quantity of nitric acid 
after irrigation. 
103. Variation in amount of nitric acid caused 
by light rainfalls. 
101. Variation of nitric acid in ground water 
due to capillary movement of nitrates. 
105. Nitric acid absent in well A. Dec. 7. 1898. 
106. Nitric acid in well A more constant than in 
the others. 
108. No relation between amounts of nitric 
acid in adjacent wells. 
112. Ground water richer in nitric acid than 
that from neighboring land 
114. Condition of plot probably not restrictive 
of the formation of nitric acid. 
115. Free ammonia in ground water. Nitrous 
acid in ground water before and after 
irrigation. 
118. Nitrous acid in ground water. 
119. Nitrites Jess abundant in ground than in 
drain water. Nitrites increased more 
by irrigation than nitrates 
120. Ammonia in ground and drain waters 
121. Albumenoidal ammonia before and after 
irrigation. 
122. Nitrates in off-flowing water. 
123. Increase of nitrates in ground water 
caused by irrigation 
124. Nitrates removed by off-flowing water lim¬ 
ited. 
125. Decrease in nitrates after irrigation ex¬ 
plained. 
128. Drainage out of soil into wells slow. 
Summary. 
Tables I to XVII. 
