INDEX 



687 



Transmission of disease, by flies, 384, 41 1 

 by gardener's hose, 219, 332 

 by grafts, 20, 469 

 by hail, 410 



by lepidotera larvae, 159 

 by molluscs, 25, 33 

 by nematodes, 33, 181 

 by nursery stock, 62, 385, 469 

 by pruning tools, 73, 384 

 by seeds, 20, 56, 58, 148, 159, 



161, 216, 297 

 by seedsman, 20, 159, 174 

 by snails, 33 

 by soil, 21, 195, 469 

 by tubers, 278 

 by well-water, dew, or rain, 21, 



411 

 methods of control, 68 

 wind driven rain, 21, 337 

 worms, 25, 410, 411, 469 

 Trap crops, 74 



Tubercles and tumors in plants as a 

 result of bacterial infection, 50, 389, 

 413 

 Tubeuf on intumescences, 631 

 Tumors, etiology of, more important 

 than structure, 510 

 excessive movement of foodstuffs to 



vicinity of, 519, 541 

 formed by bacteria, 50, 389, 413, 558 

 structure of, 51, 424, 425, 427, 

 428, 429, 430, 431, 454, 455, 

 464, 465, 467, 470 

 formed by chemicals, 483, 551 



structure of, 491, 492, 493, 494, 

 495, 497, 501, 503 

 formed by freezing, 485 



structure of, 505 

 formed by increase of aciditj^, 513, 



531, 543 

 formed by loss of water, 513 

 formed by nematodes, 543 

 structure of, 550 

 ' formed by oxygen-hunger, 513, 531 

 formed by sand blast, 489 



structure of, 507 

 formed by semi-asphjj^xiation, 496, 515 

 formed by wounding, 489 

 formed in absence of parasites, 477- 

 509 



Tumors, formed in sealed tubes, 502 



figures illustrating, 520, 521, 

 522, 523, 524, 526, 527, 528, 

 529, 530, 540 

 formed not by strong light, 496, 539 

 formed on potato shoots in sealed 

 tubes 

 figures illustrating, 532, 

 533, 534, 535, 536, 537, 

 538, 539, 540 

 formed on potato shoots in the open, 



542, 544, 546, 547, 548 

 general discussion of origin of, 510- 



572 

 giant cells in, 543, 545, 550, 565 

 higher type of, 413, 558 

 hyperplasial, non-parasitic, on 



potato, 506 

 in begonia, 502 

 in fig, 502 



in leaves of grape, 491, 496 

 in mulberry, 502 

 literature, 572, 631 

 many classes of, 510 

 physical-chemical stimuli underlying, 



510-572 

 secondary causes, 511, 566 

 stasis in tissues originating, 513, 531, 



541 

 theory of cause, 511, 555, 566, 568 

 Turnips, black rot of, 145. (See black 



rot of crucifers.) 

 Tyloses, origin of, 477 



United States, bacterial diseases found 

 in, 54 



Vacuum pumps, 80 



Varieties resistant to disease, 75, 135, 

 149, 295, 377, 383, 386, 387, 410, 

 411 

 sensitive to disease, 167, 277, 290, 

 291, 377, 410 

 Vascular diseases, 132, 145, 160, 177 

 tissue invasion in, 10, 141, 166, 

 196 

 Velox printing paper, 122 

 Vine diseases in France and Italy, 66 

 Virulence, loss of, 19 

 symbionts and, 477 



