INDEX. 



575 



PAGB 



Irrigation, basin, advantages and disadvantages 244 



by check' flooding 237 



flooding 237 



furrows 238 



lateral seepage 242, 241 



shallow, deep and wide furrows ; diagram 239 



surface sprinkling. 237 



underground pipes 245 



ditches, leaky, effects on alkali lands . . .' 429 



excessive surface rooting caused by 245 



methods of 236 



necessitates co-operation 1 . 419 



Irrigation water, abundant use of saline 249 



duty of 251 



economy in use of 243 



effects of saline, figures 247 



heavy losses in using 252 



limits of salinity , 246, 248 



loss by evaporation 252 



loss by percolation ; diagram 253 



quality of 246 



saline, how to use 249 



testing penetration of 242 



temperature of 244 



Irrigation, winter, advantages of 236 



Isinglass 43 







J- 



Janesville loam, chemical analysis of 331 



Japan current 296 



Jasper and hornstone pebbles, weathering of 30 



K. 



Kainit, composition of 71 



Kaolinite and clay ; kaolin 32 



assumes plasticity on trituration with water.' 60 



crystalline form of 22, 59 



lacks plasticity 60 



Kaolinization, results in zeolite-formation 395 



slow in arid regions 87, 386 



L. 



Landholding, units of, smaller in arid than in humid region 4 2 



Landlocked lakes, water of 2 7 



Land plaster as a fertilizer ; effects on soils 43 



