677 



Developer, 



for ordinary photographs, 95, 122 

 for use in making photomicrographs, 

 95, 125 



Diabrotica vittata Fabr., agent in trans- 

 mission of cucumber wilt, 30 

 Bacillus tracheiphilus winters over 

 in, 33 



Distortions, as a result of bacterial in- 

 fection, 49 



Drainage, importance of, 74 



Drawings, essentials of good, 129 

 preparation of, 126-129 



Dry plates recommended, 95, 121 



Dubois (R), experiments in chloro- 

 forming plants, 624 



Duplication of work, no danger of, 641 



Dutch East Indies, bacteinal diseases 

 found in, 52 



Dwarfing, as a result of bacterial infec- 

 tion, 48, 49 



Effect of cold, heat, anesthetics, litera- 

 ture, 630 

 Emerson, wisdom of, 653 

 Entomology, subsidiary study in plant 



pathology, 634 

 Eel worm, galls due to, 543 

 Environment, effect of changes of, on 



parasite, 12 

 Enzymes, excess of in diseased potato 



shoots, 543 

 Erythrina, root disease of, 52 

 Ether, as a stimulus to dormant buds, 



609, 622 

 Ethics of research, 648 

 Experimental method, importance of, 



638 

 Experiments necessity for repetition of, 



637, 638, 640, 642 " 

 Eyepieces, Zeiss, 85 

 Eyestrain, 661 



Field corn, attacked by Stewart's dis- 

 ease, 160 



Filing systems, 131 



Filters 



Berkefeld, 79 

 Chamberland, 79 



Fire, use of, in isolating bacteria from 



tissues, 107 

 Fire-blight of apple, pear, quince, etc. 



(See also Bacillus amylovo- 



rus), 359 

 a bark disease, 359, 365 

 a blossom-blight, 359 

 appearance of diseased tis- 

 sues, 359 

 bacterial ooze in, 365 

 Burrill's studies of, 1, 367 

 control of, 365, 367, 385 

 description of causal organism, 



367-372 

 disintegrating action, 365 

 early stages of disease, 359 

 economic importance of, 55, 



365 

 etiology, 367 



figures illustrating, 360, 361, 

 362, 363, 364, 366, 367, 368, 



369, 370, 375, 383 

 following crown gall, 384 

 geographical distribution, 365 

 germicidal treatment, 71, 386 

 hailstone infection, 385 

 histology, figures illustrating, 



371, 372, 373 

 history of the disease, 359, 360 

 hold-over blight or winter 



stage, 360 

 home in United States, 385 

 host plants, 359 

 inoculation experiments, 374 

 insects transmit, 360, 384, 385 

 isolation of causal organism, 



374 

 late stages of the disease, 360 

 literature, 387 

 means of detecting hold-over 



blight, 381 

 nectarial disease, 360 

 on wild shrubs in United 



States, 359 

 orchard destroyed by, 375 

 parenchymatic disease, 359 

 pruning for prevention, right 

 sort of, 367, 376 

 wrong type of, 362, 367 

 Reimer's studies of, 386 



