INDEX 



XXXlll 



made available, 76; conditions fa- 

 vorable to nitrification, 76-77 ; add- 

 ing nitrogen to the soil, 77-79; 

 chemical analysis of soil, 79 ; value 

 of plant food, 79-80; loss of, 83- 

 84 



Plants, feeding and growth of, 23 ff. ; 

 factors determining the harvest, 

 23 ; climate, 23-24 ; where plants 

 obtain food, 24 ; composition of 

 plants, 25 ; elements of plant food, 

 25-26 ; how plants obtain food, 26 ; 

 root hairs, 26-28 ; use of water by 

 plants, 28-31 ; how organic matter 

 is made, 31-32; propagation of, 

 35 ff- '> embryo, 36 ; requirements 

 of germination, 36-37 ; life of seeds, 

 37-38 ; seed planting, 38 ; bud 

 growth, 38-39 ; layers, runners, and 

 root tips, 39-41 ; separation and 

 division, 41 ; cuttings, 41-42 ; graft- 

 ing, 43 ; budding, 44 



Plants and animals, improvement of, 

 8ff. ; ancient and modern improve- 

 ments, 8-9, 21 ; nature of improve- 

 ments, 8-9, 21, 139-140; examples 

 of improvement, 9-1 1 ; systematic 

 selection, 10-14, 140, 143-146; ear- 

 row method, n, 13-14; continuous 

 care, 12-13, 20-21, X 38; hybridiza- 

 tion, 14-19; Mendel's Law, 14- 



J 9 



Pliny, quoted, 156 



Plowing, value of deep, 162-164; to 

 destroy insects, 309 



Plumb, C. S., 352, 371, 394 



Plums, 43, 44, 263 ff. ; black knot of, 

 290 



Poisons for insects, 301, 306, 309 



Pollination, 154, 209 



Poplars, 281 



Potash, 108, 184, 231 



Potassium, 25, 72 ff., 92, 94, 96, 116, 

 118-119, 327 



Potassium chloride, 106 



Potassium fertilizers, 105-107 



Potassium sulphate, 106 



Potato, the Burbank, 10 



Potatoes, 25, 35, 42, 46, 106, 107, no, 

 218, 231, 232, 233-234; water 

 drawn from soil by, 29 ; potatoes 

 and dry farming, 131 ; blight of, 

 287, 291-292 ; wilt of, 288 ; scab 

 of, 289 ; dry rot of, 291 



Potter, A. A., 455 



Poultry, 418 ff. (see also Feeding ani- 

 mals) ; to kill insects, 310; im- 

 portance of industry, 418; poultry 

 chiefly chickens, 418 ; primary poul- 

 try product, 418-419; classes of 

 chickens, 419 ; breeds and varieties, 

 420; farm poultry, 421 ; essentials 

 of a good poultry house, 421422 ; 

 sanitation of chicken houses, 422- 

 424; feeds and feeding, 425; scratch- 

 ing feed and the mash, 426-427 ; 

 typical rations for laying hens, 427- 

 428 ; rations for young chickens, 

 428-429 ; saving eggs for hatching, 

 429 ; incubating, 430 ; management 

 of the incubator, 430-43 1 ; brooding, 

 431-432; saving eggs for market, 

 432-433 ; fertile and infertile eggs, 

 43 T, 433 ; best eggs for market, 433 



Production, history of, 3-6 



Protein, 31, 33, 93, 325, 340, 401, 425 



Pruning, 269-272 



Puff balls, 289 



Pupa, the, 302 



Purdue Agricultural Experiment 

 Station, 394, 424 



Purdue University, 332 



Purvis, Miller, 435 



Questions and problems, 7, 22, 33- 

 34, 45, 56, 69, 80, 89, 99, 113, 120, 

 131-132, 153-154, 175' l8 9 202- 



203, 221, 229-230, 234-235, 240, 



246, 259-260, 275-276, 285, 298, 



311, 318-319, 329, 349, 350, 370, 

 378, 394, 407, 416, 434, 447, 454- 



455 



Quicklime, 112 

 Quinces, 9, 43 ; blight of, 289 



Rape, 228-229, 328, 401, 405 



Raspberries, 41 



Rations, 320 ff. ; for horses, 339 ff. 



Reaping machine, the, 2 



Red clover, 207 ff., 228, 405 ; distri- 

 bution and adaptation of, 207 ; im- 

 portance of, 207 ; getting stand of, 

 207-208 ; nurse crop for, 208-209 ; 

 hay from, 209 ; seed production, 

 209-210 



Redtop, in, 195-196 



Redwoods, 281 



Removal of plant food, 83-84 



Resistant varieties of plants, 296 



Rhode Island, corn in, 142 



