INDEX 



679 



Hyperplasias in plants, gall flies a cause, 



552, 560 

 increased acidity a cause, 515, 531, 



541 

 myxomycetes a cause, 549 

 nematodes a cause, 543 

 primarily due to physical-chemical 



stimuU, 558, 563, 568 

 result of bacterial infection, 51, 413 

 semi-asphyxiation a cause, 496, 



502, 511, 513, 519, 541 

 wounding a cause, 489 

 Hypertrophy, caused by physical- 

 chemical stimvilus, 508 



Ice boxes, use in culture work, 110 

 Ice thermostat, 110 



Altmann's, 81 

 Ideals of research workers, 651 

 Illustrations, preparation of 

 blue prints, 128 

 drawings, 126-129 

 engravings, 127 

 paintings, 129 

 photographs, 120 

 photomicrographs, 123 

 Imbibition, seed treatment by use of, 



preceding germicides, 71 

 Immunity, acquired, 19 

 Indexes, necessity for, 648 

 India, bacterial dis;.eases in, 54 

 Incubation, period of, 16, 17 

 Infection, 



birds, transmit, 25 

 cages for. 111 



carried on seeds, 20, 202, 297, 337 

 chemiotaxis and, 16 

 distortion of host as a result of, 49 

 due to wind-driven water, 21 

 dung heap and, 21 

 dwarfing of host as a result of, 49 

 external factors governing, 13 

 formation of overgrowths as a re- 

 sult of, 50 

 insects and, 25, 30, 74 

 internal factors governing, 12 

 rain or dew and, 21 

 recovery from, 17-19 

 spread by molluscs, 33 

 spread by nematodes, 33 



Infection, through broken roots, 15, 16, 

 181,212 



through hail storms, 15, 385, 410 



through natural openings, 16, 21, 146, 

 160, 181, 202, 282-284, 300, 317, 

 358, 360 



well water and, 21 

 Inoculated plants, care of, 113 

 Inoculation 



by use of insects, 112 



by soil. 111 



cages, 111 



methods of, 111 



syringes. 111 



time and place for, 112 

 Insects, agents in transmission of plant 



diseases, 25, 30, 74, 159, 384 

 Intumescences 



Atkinson on, 489 



due to acid stimuli, 508 



figures illustrating, 512, 514, 516, 517, 

 518 



formed by lenticel obstruction, 496 



formed in absence of parasites, 477- 

 510 



formed on potato in sealed tubes, 506 



Harvey on, 485 



literature, 572 



Sorauer's work on, 489, 491 



Tubeuf on, 631 



Viala and Pacottet on, '491 



Von Schrenk on, 483 



Wisniewski on, 496 



Wolf on, 489 

 Iris, soft rot of, 239 

 Islands of wood in bark, 478 



figures illustrating, 481, 482, 484 

 Isolation of bacteria, technic of, 80, 107 

 Italy, bacterial diseases in, 66 



Japan, bacterial diseases in, 53 

 Johannsen: etherization of dormant 



buds, 622 

 Jones' soft rot of carrot, etc., 223. (See 

 Bacillus carotovorus.) 

 disease corked out in potato, 



253 

 disintegration of tissues, 226, 



229, 238 

 dwarfing due to, 228 



