600 



Index. 



Headmaster, 481. 



Roberts, stall, 385. 



Rocks, formation of soil from, 50 ; In 

 fluence of fissures on soil formation 

 53 ; composition of compared with soil 

 77 ; composition of, 78 ; flow of water 

 through, 262 ; kinds for roads, 464. 



Rock crushers, 459, 475. 



Roller, uses of, 236 ; weight of for farm 

 use, 237; types of, 237; danger in 

 uses of, 237 ; should be followed by 

 harrow, 237 ; may strengthen capil- 

 lary rise of soil moisture, 174 ; as a 

 tool for producing mulch, 192 ; in 

 fluence of on soil temperature, 221 

 for roads, 473, 475, 484, size, 473. 



Rolling, grain after up, 192 ; influence 

 of on soil ventilation, 210 ; influence 

 of on soil temperature, 221 ; influence 

 of on capillary rise of water, 174 ; of 

 roads, 474 . 



Roman roads, 461, 478 ; roads, 474. 



Root hairs, structure of, 147 ; relation of 

 to soil grains, 147, 148; method of 

 gathering water, 147 : conditions for 

 Improved by proper tilth, 233. 



Root pressure, influence of soil tempera 

 ture on, 215. 



Roots, functions of, 145 ; absorbing por- 

 tion of, 146 ; structure of root hairs, 

 147 ; advance of through soil, 148 ; ex- 

 tent of development of In corn, 150, 

 151, 152, 154 ; in grain, 150, 153, 155 ; 

 total system, 154, 155, 156, 3?>7: 

 near surface late in season, 189 ; 

 Influence of on soil ventilation, 210 ; 

 room for increased by drainage, 287 ; 

 obstruct tile drains, 303. 



Rothamstead, experiments at, 81 ; nitro- 

 gen in soil at, 82. 



Round barn, frame, 341 ; consolidated 

 type, 371 ; handling hay In, 391. 



Rowland, heat unit, 28. 



Ruberoid roofing, for ventilators, 364 ; 

 for silo doors, 411, 423. 



Russia, nitrogen in soils of, 82. 



Salt ased with Ice as freezing mixture, 

 30 ; solution of, 7. 



Sal-soda, for boiler scale, 517. 



Sanborn, J. W.. draft of plows, 243. 



Sand, specific heat of, 29, 32. 216: flow 

 of water through, 123 ; rate of percola- 

 tion through, 159 ; water reservoir, 

 255 ; law of now of water through, 262 : 

 method of measuring flow of water 

 through. 264. 267 ; relation of pressure 

 to flow through, 266 ; observed rates of 

 flow through, 268 ; sandstone, capacity 

 for water, 255 ; rate of fiow of water 

 through, 268 ; apparatus for measur- 

 ing flow of water through, 269 ; as 

 source of water for wells, 276. 



Sandy soil, compared with clay, 71, 74, 

 75 ; amount of plant food in, 80 ; 

 wind breaks to protect, 202 ; rapid 

 decomposition of humus in, 206. 



Sand strainers, uses, 280; capacity of 

 compared with open suction, 281. 



Scale, in boilers, 517. 



Schlosing, denitrification, 90. 



Schlosing, Jr., symbiosis, 68. 



Schmidt, C., nitrogen in soils, 82. 



Schroeder, function of potash, 70. 



Scouring of plows, 247. 



Screen rock, 451, 459, 477. 



Seed bed, thorough preparation for. 222. 



Seeds, absorption of moisture by, 6, 60 : 

 require magnesia, 71 ; germination, 

 213, 225. 



Seepage, growth of streams due to, 258. 



Sheep, bad effect of cold rains on, 33, 

 amount of air breathed, 354. 



Sheeting, silos, 405, 412, 414. 



Showers, thunder, 586 ; relation to low 

 areas, 576, 588; formation of, 592. 



Shubler, weight of soils, 128. 



Silage, conditions for preserving, 394 ; 

 lateral pressure, 394 ; loss of in stave 

 silo, 420 ; weight per cu. ft., 424 : 

 proper feeding area, 425 ; generation 

 of carbon dioxide in, 427. 



Silos, relation of depth to capacity. 367 : 

 importance of depth, 394 ; rigidity of 

 walls, 394 ; depth of in ground, 39:. ; 

 construction against freezing, 39<i : 

 stone, 397; laying wall, 397, 402: 

 plastering, 398; doors, 396, 399, 40M. 

 411. 423; strengthening walls, 390. 

 401. 402. 410; brick; 400; bricV 

 lined, 403 ; sill, 405, 410 : setting, stud- 

 ding,' 405, 411: sheeting, 405, 412, 

 414 ; siding, 406, 412 ; lining, 403, 

 406. 4-13 : reund plastered, 407 ; wood. 

 409 ; foundation, 400, 405, 409 ; ce- 

 menting bottom, 382, 410 : plate. 418 : 

 roof, 417 ; ventilation, 417 ; decay of, 

 417; painting liniHg, 418: stave, 418; 

 hoops for, 422 ; pit silo, 423 ; capacity 

 of, 424 : feeding area, 425 ; danger in 

 filling, 427. 



Silt basin, construction and use, 299. 

 Slichter, C. S., formula for computing 

 effective diameter of soil grains, 111 ; 

 formula for flow of water through 

 soil. 262 ; computed capacity of wells, 

 280. 



Smell, sense, delicacy of, 13. 

 Smith, Angus, denitrification, 90. 

 Smith, C. S., strength of pillars, 329. 

 Snow, latent heat of, 34 : melting for 



washing, 35. 

 Snow storm, chilling effect from heat 



lost in melting, 34. 

 Sod plow, form, 241, draft of, 243. 244 ; 



dralt compared with stubble, 244. 

 Sodium nitrate, number of molecules per 



gram, 11. 

 Soft plug, 514. 



