604 



Index. 



298. See ground water ; In expired 

 air, 350 ; relation of to roads, 446 ; 

 in atmosphere, 558 ; for steam boilers, 

 517. 



Water breaks, 449. 



Watering stock in barn, 388; trough, 

 390 ; tank, 390. 



Waters, J. H., draft of wagons, 436. 



Water capacity, of soils, 114, 131, 132, 

 134 ; relation of to surface of soil 

 grains, 124 ; increased by subsoiling, 

 199. 



Waves, of solar energy, 21 ; kinds of, 23 ; 

 transparency to, 24 ; produce chemical 

 changes, 24. 



Weather, forecasting, 554, 583 ; of dif- 

 ferent wind zones, 565, changes, 578 ; 

 influenced by storms, 580, 582. 



Weeder, 226. 



Weeds, best time to kill, 192, 224; till- 

 age to destroy, 223, loss of plant food 

 through, 224 ; do not all germinate at 

 once, 225 ; best tools for killing, 225 ; 

 covering in row, 228 ; jointer for 

 plowing under, 249. 



Wells, level of water in, 255 ; soils and 

 clay supply water too slowly for, 257 ; 

 fluctuations in flow from, 270 ; fluctu- 

 ations in level of water in, 272 ; es- 

 sential features of, 275; capacity of, 

 275 : geological conditions best suited 

 to, 276 : depth of, 283. 



Wheat, exhaustion of soil by, 80 ; Roth- 

 amstead experiments with, 82 : water 

 used by, 140, 141 : extent of root de- 

 velopment of, 150, 153 ; temperature 

 for germination of, 213. 



Wheels, effect of size on draft, 437, 490 ; 

 width of tire, 436, 481. 



Whitewashing, silo linings, 398, 402, 

 403, 408. 



Whitney, alkali salts limiting plant 

 growth, 93. 



Winds, formation of soils by, 63 ; soil 

 ventilation influenced by, 208 ; prim- 

 ary cause of, 561 ; of the globe, 562 ; 

 zones of, 563 ; influence of earth's ro- 

 tation on, 564 ; character of, 564 ; con- 

 tinental, 566; of January, 567, 568; 

 of July, 567, 569 ; monsoon, 570 ; cy- 

 clonic, 570 ; anticyclonic, 572 ; direc- 

 tion of in forecasting, 579, 580 ; rela- 

 tion to cold waves, 582 ; relation of 

 pressure to velocity, 532 ; working 

 power of, 533 ; unsteady character of, 

 534. 



Wind-breaks, to conserve soil moisture, 

 202. 



Windmill, 531; pumping by, 531, 535; 

 grinding by, 531, 536 ; relation of di- 

 ameter to efficiency, 533 ; towers for, 

 534. 



Wind pressure, force in ventilation, 346, 

 358 ; relation to velocity, 532 ; rela- 

 tion to altitude, 532, 534 ; relation to 



Wind zones, 5^3 ; weather of, 565 ; shift- 

 Ing of, 565. 



Windows, efficiency of, 848; position of, 

 349. 



Winogradsky, symbiosis, 88. 



Wollny, influence of color on soil tem- 

 perature, 217. 



Wolff, ash of crops, 79. 



Wolff, A. R., wind pressure, 532. 



Wood floors, for stables, 377. 



Work, 18 ; units of, 27. 



Z. 



Zero, absolute, 23 ; of thermometers, 25. 



