TABLE OF CONTENTS. 
SECTION. 
1. Source of waters. 
2. Preservation of water supply. 
3. Character of streams and collecting grounds. 
4. Headwaters of the Cache a la Poudre river. 
5. Poudre conditions applicable to other 
streams. 
6-7-8. Reasons for taking the Poudre as typ¬ 
ical stream. 
9. The present time an opportune one for this 
study. 
10. Character of water changed by return wa¬ 
ters . 
11. Quantity of return waters. 
13. Character of collecting grounds of the Pou¬ 
dre river. 
14. Changes in water while in mountain section 
of river. 
15. Chemical work done by water per day. 
16. Object of the Bulletin stated. 
17-20. Felspar as the source of the mineral flat¬ 
ter. 
21. Rocks of the drainage area. 
22. Experiment with felspar. 
23. Other experiments with felspar of cumu¬ 
lative value only. 
24-25. Analyses of Poudre water and the object 
purposed. 
26. Felspar the source of the mineral matter in 
the Boulder and Clear Creek waters. 
28. Sulfuric acid and chlorin furnished by fels¬ 
par. 
29. Significance of strontia and lithia in our 
river waters. 
30. Poudre water represented by samples ana¬ 
lyzed. 
31. Increase in total solids contained in the 
Poudre water. 
32. Character of changes in total solids. 
33. Quantity of solids carried above mouth of 
North Fork and at water works ditch 
compared. 
34. Water so changed in lower portions of the 
river that comparisons cannot be made. 
35. The sources of water stored in reservoirs; 
evaporation neglected. 
36. Increase of total solids in stored water due 
to evaporation. • 
37. Area of Terry Lake. Aggregate of solids 
contained in water annually evaporated 
from its surface. 
38. Terry Lake presents extreme changes, pro¬ 
duced by storage. 
39. Sources of supply of water for Terry Lake. 
40. Weight of the mineral matter held in solu¬ 
tion by the water of Terry Lake. 
41. Extent of drainage area of Dry Creek. 
42. Location and size of Long Pond. 
43. Location of Warren’s Lake. 
44. Location of Windsor Reservoir; conditions 
under which sample was taken. 
45. Amount of mineral matter held in solution 
by water of Windsor Reservoir. 
46. Relative quantities of the various salts in 
water ot Windsor Reservoir. 
47. Reason why potash is the only plant food 
considered. 
48. Amount of potash contained in two acre- 
feet of stored water. Potash largely 
furnished by seepage water. 
49. Nitrogen furnished by water is not signifi¬ 
cant in amount. 
50. Aggregate of plant food distributed tends 
to maintain the ferti ity of the soil. 
51. Amount of salts not plant foods distributed 
by the water o' Windsor Reservoir. 
52. Amount of salts not plant foods distributed 
by the water of Terry Lake. 
54-55. Poudre water taken for direct irrigation 
ought to be the standard for the compari- 
SEOTION. 
son of changes suffered by water used in 
irrigation. 
56. Dates of experiments on changes of water 
used in irrigation. 
57. Water an! soil experimented with in 1899. 
58. Conditions under which experiments of 
1898 were made. 
59. Amount of water applied, the whole of it 
entered the soil and was added to the 
ground water. 
60. Reason why average results are presented. 
61. Amount of salt passing into solution within 
the soil. 
62. The amount of potash passing into solution 
in the ground water. 
63. The water used in 1899. Acknowledgment 
to Water Commissioner C. C. Hawley. 
64. Seepage water neglected in the calculation 
of results obtained in 1899. 
65. Amount of total solids in ditch water used. 
66. Amount of total solids and of the several 
salts in the seepage water. 
67.. Total solids in the ground water before and 
after irrigation. 
68. The amount of salts brought into solution 
in ground water by irrigation in 1899. 
69. Order in which the respective salts went 
into solution. 
70. Amount of potash brought into solution in 
the ground water by the application of 
an acre-foot of water. 
71-72-73. Off-flow, amount of salts removed. 
74. Potash is removed from soil by off-flow 
water. 
75. Effect of irrigation upon composition of 
ground water as shown by the sanitary 
analyses. 
76. Nitrates in seepage water. 
77. Nitrates in ground water before and after 
irrigation. 
78. Nitrous acid before and after irrigation. 
79. Condition prevailing in spring of 1900. 
80. Composition of well A in spring of 1900 
compared with average composition in 
1898. 
81. Rate at which the mineral matter held in 
solution in well A decreased in spring of 
1900. 
82. Facts shown by well G. 
83. Facts shown by samples taken one month 
later, when the water plane had fallen 16 
inches. 
84. Potash in waters of wells A and G. 
85. Irrigation experiments indicate that the 
salts do not pass into ground water by 
simple solution. 
86. Drain waters. 
87. Drain and ground water not identical- 
cause of the differences. 
88. Drain waters more constant in composition 
than ground waters. 
89. Drain waters contain more sodic carbonate 
than ground waters. 
90. Drain on ranch of Mrs. Calloway. 
91. Sample taken Feb. 23, 1903, • comparable to 
ground water analyzed. 
92. Potash in ground waters and in drain water. 
93. Sodic sulfate in ground and drain waters. 
94. Sodic chlorid in ground ana drain waters 
95-96-97. Sanitary analyses, nitric and nitrous 
acid in ground and drain waters. 
93. Return waters; brief recapitulation. 
99. The experiments may exaggerate relations 
of individual results. 
100. Seepage begins to return immediately on a 
stre »m’s entering the plains. 
101. Return waters are essentially the drain wa¬ 
ter from a large section. 
102-103. Samples of Poudre water given prece- 
