"Index. 



595 



Denitrlfloatlon, process of, In dry eart 

 closet, 90 ; In sewage water, DO ; i 

 water-logged soils. 90. 205 : in mars 

 soil, 90. 



Deodorizing milk, 16. 

 Deodorizer, 17. 



Deserts, relation to wind zones, 565. 

 DeVrles, alkali salts, limiting plan 



growth, 93. 



Diffusion, principles of, 40 ; Influence o 



temperature on, 40 ; slow rate in soi 



40 : in plant feeding, 46 ; in soil ven 



tilation, 207. 



Disease, caused by lack of ventilation 



352. 



Disk harrow, 234 : use In early spring 

 to develop mulch, 185 ; to n't seed bed 

 234. 



Distributing cart, 469, 470. 

 Ditch digging, 322 ; shaping and eradin 

 bottom, 322 ; placing tile in, 324 ; fill 

 ing, 328. 



Dog, normal temperature, 344. 

 Doors, construction of for silos, 396 

 399, 403, 411, 421, 423 ; strengthen 

 Ing wail between, 399, 402, 410, 423 

 Draft on macadam road, 18 ; of plow 

 241, 243 ; influence of soil moisture 

 on draft of plows, 244 ; line of in 

 plow, 246 ; principles of, 428 ; rela 

 tlon to grade, 430 ; of wagons, 434 

 436, 490 ; relation of width of tire to 

 436; of size of wheel, 437; of dis 

 tribution of load, 438 : of line 01 

 draft, 440, 492, 497; of rigidity of 

 carriage, 442 ; of speed, 491 ; of hours 

 work per day, 492 ; of weight of 

 horse, 493 ; of distribution of weight 

 In the horse, 494 ; of strength of hock 

 muscle, 494; of width of hock, 495 

 line of In sweep power, 502. 

 Drainage, remedy for alkali lands, 98 . 

 rate of, determined by pore space, 115 ; 

 may increase available soil moisture, 

 139, 288 ; influence on soil ventilation, 

 210, 290 ; Influence on soil tempera- 

 ture, 222, 228 ; necessity for, 286 ; In- 

 creases root room, 287 ; conditions re- 

 uiring, 287 ; interception of surface, 

 06 ; of basins without outlets, 307 ; 

 of flat areas, 309 ; Intercepting under- 

 flow, 307 ; practice of, 311 ; tools for, 

 312, 321 ; determining levels for 312 ; 

 of roads 445, 448, 449 ; water-breaks, 

 449. 



Drains, fluctuations In rate of flow from. 

 270 ; barometric changes in rate of 

 flow from. 271 ; temperature changes 

 1n rate of flow from, 271 ; kinds of, 

 290 : depth of. 292 ; distance be- 

 tween, 296 ; surface of ground watei 

 between, 297 ; rate of change of 

 ground water between, 297 ; gradient 

 for, 298 : uniform fall for Important 

 298 : outlet for. 302, 303 : connection 

 of sub-main with main, 303: joining 

 lateral with main, 303 ; obstructions 



q 

 3 



to, 803; laying out systems of, :'. 

 construction of surface, yuc, ; levell 

 for, 312; locating mains and laterals, 

 315 ; determining grade and depth, 

 317 ; changes in grade, 319. 



Drown, cow stall, 385. 



Dry earth closets, denitriflcation In, 00. 



Dust in soil formation. M : micro-organ- 

 Isms, In of houses and stables, 

 avoiding in concrete, 380; of atmos- 

 phere, 557, 558. 



Ebermayer, best temperature for growth, 

 212 ; observed soil temperatures, 314. 



Eel grass, 63. 



Elbows, resistance to flow of water, 

 550. 



Elliott, C. G., size of tile, 301, 302. 



Energy, 19 ; conservation of, 19 ; trans- 

 formation of, 20 ; solar, 20, 22 ; units 

 of, 27 ; amount required to melt ice, 

 30 ; to evaporate water, 31. 



Engine. 518 ; steam, 502 ; gasoline, 522 ; 

 see steam and gasoline. 



Erdmann, function of potash, 70. 



Ether waves, 21 ; velocity of, 22 ; kinds 

 of, 23 ; transparency to, 24 ; produce 

 evaporation and chemical changes, 24. 



Evaporation, 24, 30 ; heat required for, 

 30 ; rate of Influenced by dissolved 

 salts, 106; influence of on soil tem- 

 perature, 32, 220. 



Evener, kinds, 496 ; principles of, 497 ; 

 giving one horse the advantage, 498 ; 

 more than two horse, 499. 



'allow ground, nitric acid In, 84 ; ni- 

 trates in, 103 ; loss of nitrates from, 

 104. 



arm buildings, frames, 340 ; means of 

 controlling temperature, 346; lighting 

 of, 348 : ventilation of, 350. 



arm machinery, 538. 



Farm motors, kinds, 486 ; tread power, 

 499 ; sweep power, 501 ; steam engine, 

 502 ; gasoline engine, 522 ; windmill, 



Fattening animals, best temperature for. 



Deeding, of odor producing foods, 15. 

 ^errel, world system of winds, 563. 

 Fertility, of soils In arid regions, 50; 



conditions essential to. 69. 

 'ertlllzers, diffusion of through soil. 11 ; 



Influence of, on amount of nitrogen 



removed from soil, 82. 

 Field soils, permeability of to air, 127 ; 



weight of dry, per cu. ft., 127 ; heavy 



and light, 128. 

 issures in rock, 53. 

 lavors, In dairy products, 14 ; how they 



are absorbed, 14; removal of. li; 



time to feed odor-producing foods, 15. 



