INDEX 



461 



Hydrocyanic acid gas, action of 

 water in forming, 224 ; amount 

 to use in fumigation, 221 ; cya- 

 nide in, 222 ; effect on plant life 

 of, 220, 221 ; fumigation with, 

 221 ; order of mixing, 224 ; pro- 

 portion of different ingredients in, 

 224 ; purity of materials used in, 

 222 ; quality of sulfuric acid used 

 in, 222 ; quantity of sulfuric 

 acid in using, 223 ; value as a 

 fumigant of, 221, 259. 



Importation, of plants and cut 

 flowers from foreign countries, 

 440, 441. 



Improvement in quality, 10, 12. 



Income, 91, 92. 



Indian shot, 425. 



Insects, amount of injury done by, 

 212 ; attacks of, 214, 215 ; chew- 

 ing, 215 ; classification by feeding 

 habits, 214 ; effect of gases on, 

 220; list of pests commonly 

 found in greenhouses, 215 ; meta- 

 morphoses of, 213 ; method of 

 attack of, 216 ; methods of com- 

 bating, 214, 215 ; reproduction of, 

 214 ; structure of, 212 ; sucking, 

 215 ; value of prevention of at- 

 tacks of, 212. 



Investigation, need of, 13. 



Iron-working rooms, 53. 



Ixias, botanical classification, char- 

 acters, habitat and culture of, 

 419. 



Jerusalem cherries, 357, 358. 

 Kerosene emulsion, 225. 



Lselias, classification, characters, 

 habitat and culture of, 285, 286. 



Laelio cattleyas, classification, ori- 

 gin and culture of, 287. 



Land, amount necessary, 39, 91 ; 

 cost of, 91 ; sale value or rental 

 value of, 40. 



Leaf-mold, method of preparing, 



193 ; value in greenhouse work, 

 180, 181. 



Leaf rollers, 215, 216, 217. 



Leaf-spot, classification, microscop- 

 ical nature, reproduction, ecol- 

 ogy, preventives and remedies 

 of carnation, 209 ; of chrys- 

 anthemum, 209, 210; of violet, 

 208. 



"Lean-to" houses, advantages and 

 disadvantages of, 57, 58 ; where 

 to build, 58. 



Light, assimilation of plant food due 

 to, 164; cuttings require dimin- 

 ished, 164 ; control in propagat- 

 ing houses, 166 ; efficiency of 

 morning, 147, 148 ; improve- 

 ment in greenhouses, 46, 48 ; 

 arrangement of houses for best, 

 51, 52; in houses running north 

 and south, 53 ; requirements of 

 plants for, 120, 147, 148, 149. 



Lilies, botanical classification of, 

 335 ; characters of, 337 ; botani- 

 cal classification of Calla, 339; 

 characters and habitat of Calla, 

 339 ; commerical importance of, 

 337 ; culture of, 337 ; different 

 seasons for forcing, 338 ; forcing, 

 335; grades of bulbs of, 337; 

 habitat of, 337 ; importation of 

 bulbs of, 337 ; temperature re- 

 quirements of, 338. 



Lilies-of-t he- valley, botanical classi- 

 fication, characters, habitat and 

 commerical importance of, 399, 

 401 ; bunching and shipping, 

 442 ; freezing before forcing, 401 ; 

 general culture of, 401, 402; im- 

 portation of pips of, 401 ; indoor 

 culture of, 401 ; outdoor culture 

 of, 401 ; pan-grown, 403. 



Localization of growing centers, 

 factors which cause, 14. 



Location, climatic conditions in a 

 given, 44 ; coal transportation as 

 a factor in, 39 ; distance from 

 city for, 36, 37 ; distance from 

 railroad for, 42 ; drainage as a 



