Index. 



597 



Humus soil, formation of, 55. 61; plant 

 food per acre foot, 80. 



Hurricane, West Indian, 584, 585. 



Hutehinson, respiration, 353. 



Hydraulic ram, 552. 



Hydrogen, rate of molecular vibration, 9 ; 

 size of molecules. 10. 



Hygroscopic moisture, 175 ; movements 



'of, 175 ; relation of to diameter of 



soil grains, 17G; amount absorbed by 



s->M. 177 ; influence of temperature on, 



179. 



Ice, melting of, 29 ; In soil formation, 

 f>7 : for cooling milk, 34 ; melting 

 for water, 35. 



Illinois soils, nitrogen in, 82. 



Injector, 516. 



Infiltration pipes, lowering ground 

 water, 295. 



Ions, 48. 



Iron, essential to fertile soil, 69 ; func- 

 tion of, 70. 



Irrigation, by windmill, 531, 536. 



Isobars, 568, 569, 575. 584, 585. 



Jaffa, humus of arid climates. 76. 

 January, winds of world, 567, 568. 

 Jeffery, denitrification, 90. 

 Jointer, attachment for plow, 249 ; use In 



plowing under green manure, 253. 

 Joule, heat unit, 28. 

 July, winds of the world, 567, 569. 



Kelvin, Lord, size of molecules, 9 : 



solar energy, 22. 

 Kosswitch, symbiosis, 88. 

 Kuhn, Julius, connection of lateral with 



main drain, 303. 

 Kunkle, safety valve, 512. 



Lacing, belts, 545. 



Lakes, in formation of humus soil, 62. 



Laurent, symbiosis, 88. 



Lawes, Sir J. B., Rothamstead experi- 

 ments, 81. 



Lawes and Gilbert, nitrogen In soil, 82. 



Leaching, effect of In soil formation, 77 ; 

 a correction for alkali lands, 95. 



Leveling a field, methods of, 314 : con- 

 tour map, 315 : locatlnsr mains and 

 laterals, 315; laying out drains, 



317 ; determining grade and depth, 



318 ; changing grade, 319. 



Levers, of arm, 489; mechanical prin- 

 ciple of, 498. 



Lighting, farm buildings. 348 ; efficiency 



of windows, 349. 

 Lime, function of in plant life, 71; 



amount removed by crops, 79 : amount 



In soil, bO. 

 Limestone, formation of soil from. 52, 



78 ; source of water supply, 276 ; for 



road metal, 466, 469 ; for binding, 466. 

 Line of draft, in plow, 246; in wagons, 



440, 441. 

 Lining, for silos, 413; brick, 402, 406, 



403 ; galvanized iron, 414 ; 4-inch 



flooring, 414 ; half-Inch boards and 



paper, 415 ; painting, 418. 

 Loam, effectiveness of as mulches, 180. 

 Loess, 64, 73, 74, 75 ; amount of plait 



food in acre foot, 80. 

 Los Angeles Water Company, diagram 



of flume, 295. 

 Low area, 494, 507; course of. ."or. : *.- 



lation of to cold waves, 514; to warm 



dry periods, 515. 

 Lubricator, Swift, 521. 

 Lubricants, 541 ; reduction of friction 



by, 541 : selection of, 541 ; for gaso- 

 line engines, 529. 



M 



Macadam, Engineer, 462, 467 ; roads, 

 462 ; road-bed for, 463 ; rock for. 404, 

 466 ; without binding material, 467 ; 

 thickness of, 473 ; rolling of, 473 ; for 

 stable floor, 378; for barn yard, 379. 



Magnesia, as plant food, 69 ; function of, 

 71; amount removed by crops. 7t>; 

 amount In an acre foot of soil, 80. 



Mairs, T. J., draft of wagons. 437. 



Man, oxygen consumed, influenced by 

 temperature, 345 ; air respired by, 353, 

 354. 



Mangers, 388. 



Manitoba soils, nitrogen In, 82. 



Manure, effect of capillarity, 172 ; aa 

 mulch for meadows, 193 : green. 201 ; 

 ventilation hastens fermentation, 206 ; 

 plowing under, 253. 



Manure drop, 388. 



Maple, fuel value of, 35. 



Maps, contour of ground water, 257, 

 259 ; of surface, 2.">i;. 



Marsh soils, formation of, 62 ; analyse! 

 of, 73, 74, 75 : as mulches, 186 ; tem- 

 perature of, 220. 



Masonry walls, relation to temperature, 

 347 ; for silos, 397, 400. 405, 409, 422. 



Maxwell, size of molecules 10. 



Melon, temperature for germination, 212. 



Melting of Ice, 30, 35. 



Micro-organisms, in soil, 50 : convert 

 humus into nitric acid, 76 ; soil al- 

 gae, 88 : nitrifying, germs, 89 ; de- 

 nitrifying germs, 90 ; require air, 20r> ; 

 In air of unventilated building 

 dangers from, 353 ; In the atmosphere, 

 557. 



