602 



Index. 



Specific gravity, of soil grains, 110. 

 Specific heat, 29 ; of dry soil, 215 ; of 

 wet soils, 216 : of water, 216 ; of moor 

 earth, 216 ; of humus, 216 ; of loam, 

 216 ; of clay, 216 ; of sand, 216 ; chaik, 

 216. 



Springs, fluctuations in r^te of flow. 270. 

 Squash, germination temperature, 213. 

 Stables, temperature fur, 344 ; ventila- 

 tion of, 355 to 365 ; floors for, 374 to 

 384. 



Stalls, for cows, 384 to 387. 



Stanchions, 384, 386, 388. 



Starch, potassium required for formation 

 of. 70. 



Stave silo, 418 to 423. 



Steam, pressure of, 504 ; dry and wet, 

 504 ; condensation of, 506 ; water for, 

 517. 



Steam engine, 502 principle of 502 ; ef- 

 ficiency of, 503 ; dry and wet steam, 

 504 : priming, 505 to 508 ; relief 

 cocks, 507 ; boiler, 508 ; construction, 

 509, 518 ; gage cocks, 510 ; gage 

 glass, 510 ; pressure gage, 511 ; safety 

 valve, 511; care of boiler. 512; firing, 

 513; foaming. 513; low water in, 

 514: wato- 'or, 515; fly-wheel, 522; 

 governor, 521. 



Stone reads, 4<>1. 



Stone silos. 3D" 



Storm center, 575. 



Storms, 570 : wind directions in, 570 to 

 572 : progressive movements of. 572 

 to 574 ; rate of travel, 574 ; diameter 

 of, 574 ; duration of, 575 ; region of 

 precipitation, 575 ; prediction of. 578 

 to 580; temperature chanrs of. 50 ; 

 barometric changes of, 582 ; thunder 

 and hail, 586. 



Strength of materials, 329: of pillars. 

 330 ; tensile, 331 ; transverse, 331 to 

 336 : breaking constants, 336 ; comput- 

 ing breaking loads, 336 ; safe quiescent 

 center loads, 337. 



Stress, kinds, 320. 



Stubble plow. 242 ; draft of, 243. 491. 



Studding, use in balloon barn frame. 

 341 ; in round barn, 242 ; in silo, 405. 

 411. 



Suction pump, 543 : double-acting. 550. 



Subsoils, jointed structure in, 138 ; in I 

 arid regions, 50 ; chemical compost- j 

 tion. 74 ; differ from soils, 72 ; should 

 not v^ turned up by plow. 251. 



Subsoiling to save moisture, 195 ; meth- 

 od of demonstrating effect of on soil 

 moisturo, 1 '.)<> moisture effects of. 

 198 : how water capacity is increased 

 by. 198 ; decreases capillary rise. 199 ; 

 Influence of on percolation, 199 : in- 

 creases per cent, of available moisture, 

 200 ; dangers from, 200 ; influence of; 

 on soil ventilation, 209 ; plow for, 250 ; 

 ventilation, 209. 



Subsoil plow. 250. 



Sugar, osmotic pressure, 45. 



Sulky plow, 245. 



Sulphur, essential to fertile soil, 69 : 

 function of, 70. 



Sulphuric acid, in soils, 74, 80 : removed 

 by crops, 79. 



Sun, source of earth's energy, 20. 



Surface drainage, where needed. 306. 

 309. 



Surface drains, construction of, 306. 



Surface tension. 36 ; overcome in evap- 

 oration, 24 ; in solution, 38 : modified 

 by dissolved salts, 106 ; effect of on 

 soil texture, 233. 



Sweep power, 501. 



Swine, normal temperature of, 344 ; 

 amount of air breathed, 354. 



Symbiosis, source of soil nir-o<ren, 87; 

 need of soil ventilation for, 206. 



Tanks, for watering stock, 389, 390. 



Telford, road construction, 462, 478. 



Temperature, 25 ; expansion due to, 7 ; 

 of interplanitary space, 23 : measure- 

 ment of, 25 ; for cooling milk, 34 ; 

 regulation of in animal body, 33 ; in- 

 fluence of hygroscopic moisture on, 

 179 ;effect of changes in onsoil ventila- 

 tion, 207 ; importance of right for 

 soil, 212 ; of water in wells. 284 : see 

 soil temperature : control of. 343, 

 346 ; normal for animals, 343 ; for 

 stables, 344, 345 ; force in ventilation, 

 359 ; construction for control of 345 

 to 348, 367 ; atmospheric, 560 : influ- 

 enced by storms, 575, 580, 582, 583 : 

 effect on wind power, 532 ; of muscles, 

 488 ; of steam, 504. 



Terraces, of river valleys, 55. 



Texture, of rock in soil formation. 51 ; of 

 soil, 108. 231 ; influence on loss of 

 soil moisture, 183 ; changed in sub- 

 soiling, 199 : influence of on soil tem- 

 perature, 218 ; modified by tillage, 



232 ; importance of, 233, development 

 of, 233 ; difference of in soil and In 

 Potter's clay, 233 : of puddled soil, 



233 ; developed by plow, 238 : effect of 

 after-treatment on. 252 of '-oad ma- 

 terial, 450. 451, 456, 458. 4.10 



Thermometer, 8, 26 ; accuracy of, _6 ; 

 wet and dry bulb. 33. 22o 



Thorp, stall, 385. 



Thunder storms, associated with changes 

 of level of water in wells, 274 : rela- 

 tion to ordinary storms, 586, 588, 

 origin of, 588, 592 : progressive move- 

 ment of, 589. 



Thurston, friction. 539. 



Ties, for cattle, 384. 



Tile, essential features of. 291 : how 

 water enters. 292 ; rate of percolation 

 into. 292 ; injured by frost. 291 ; clay 

 suited to manufacture of. 291 : use of 

 collars for, 292 ; size of, 21)9, 301. 



