496 



Index 



Gasoline engine, 305, 324, 393 ; cost of 

 mnning, 324. 



Gasparin, ratio of grain to straw,l96 ; 

 salt in soil, 276. 



Gennevilliers, sewage irrigation, 389, 

 411; model gardens, 408 ; sewage hy- 

 drant, 410 ; stone canal, 410 ; health- 

 fulness, 413. 



Gipps, F. S., 66. 



Goff, E. S., irrigation of strawberries, 

 181; depth of roots, 231. 



Goodale, G. A., 51. 



Goss, Arthur, 253, 259. 



Grade pegs, 478. 



Grader, 350, 351, 352. 



Grading for irrigation, 346, 348, 351. 



Grain, irrigation, 340, 342, 344, 346 ; dry 

 farming, 103 ; harrowing and rolling, 

 146 ; thin seeding, 163 ; duty of water, 

 198. 



Grapes, roots, 232; frequency of irriga- 

 tion, 238. 



Grass, observed yields, 127; on sewage 

 meadows, 92, 409; on water-meadows, 

 219 ; irrigation, 340, 342, 346 ; in lawns 

 and parks, 392. 



Gravel, silted, 263. 



Greeley, Colorado, irrigation of grain, 

 340 ; potatoes, 354. 



Green manure, 151. 



Ground-water, origin, 429 ; relation to 

 surface, 431, 435 ; lines of flow, 432, 

 438 ; discharge into streams, 433 ; 

 gradient, 435; changes in level, 440. 



Growth of river, 433. 



Grunsky, C. E., 292, 349. 



Hall, Wm. H., 211. 



Hare, R. F.,253. 



Harrington, M. W., 99. 



Harvey, F. H., 309. 



Hawaii, irrigation, 86; duty of water 

 for sugar cane, 214. 



Hay, yields, 127, 178 ; need for irriga- 

 tion, 128 ; second crop, 130, 179 ; duty 

 of water, 215. 



Hazzard, W. M., rice irrigation, 238. 

 Health, influence of sewage, 256, 295, 

 Hellriegel, 96. [413. 



HCgard, E. W., peculiarities of arid 



soils, 6, 229 ; alkali lands, 269, 276 ; 



composition of alkali salts, 278 ; land 



plaster for alkali lands, 280,284; roots 



in arid soils, 6, 229. 

 Hinton, R. J., 78, 81. 

 Hollis, Geo. S., 85. 

 Humidity of air, 40, 44, 50. 

 Hunter, intertillage, 157. [410. 



Hydrants, distributing, 301 ; sewage, 

 Hydraulic rams, 310. 



Inch, acre, 240; miner's, 241. [291. 



India, irrigation, 77, 328; Sirhind canal, 



Insects, destroyed by irrigation, 218, 221. 



Intertillage, 157. 



Irrigation culture, 66. 



Irrigation, antiquity, 66; extent, 72; ob- 

 jects, 91; climatic conditions, 89; fre- 

 quency, 107, 212, 223, 234, 236 ; insuf- 

 fiency of water, 117 ; amount of water, 

 196, 208, 212, 213, 214, 236 ; late crops 

 difficult to grow without, 129 ; in- 

 crease of yield in humid climates, 171 ; 

 closer planting possible, 181 ; tillage 

 as a substitute, 117 ; character of 

 water, 248 ; temperature, 248 ; num- 

 ber of irrigations required, 235; fer- 

 tilizing value, 251 ; supplying water, 

 290 ; methods of application, 329 ; 

 sewage, 403. 



Italy, irrigation, 71, 359; duty of water, 

 209, 219 ; water-meadows, 219 ; mar- 

 cite, 219 ; sewage, 220. 



Ivrea canal, 209. 



Japan, irrigation, 82. 

 Java, irrigation, 86. 



Kansas, yields of grain, 103; rainfall, 



103. 



Kern Island canal, 292. 

 Kiihn, Jul., 454. 



