676 



Crown gall, method of isolating organ- 

 ism, 432-438 



non-infectious colonies from, 468 



nurserymen common distributors 

 of, 469 



olive resistant to, 469 



on chestnut, 413 



onion resistant to, 469 



on oak (undetermined), 414 



on rasin grapes in California, 417 



on wild fig, enormous size of, 414 



on willow in Africa, 417 



parasite intracellular, 419 



parasite, how carried in the tissues, 

 419 



parasite, occurs in small numbers, 

 433 



Peklo's studies, 463 



peroxidases in, 457, 563 



phenomena suggesting cancer, 51, 

 558, 569 



prolonged incubation period in an 

 orange tree, 17, 448 



respiration accelerated in, 563 



roots from, 421, 458 



secondary etiology of, 558 



secondary tumors from primary 

 tumor with structure of latter, 

 417 



secondary tumors, time required 

 for development, 459 



shoots from, 419, 439, 440, 442, 

 444 



stages in development of, 563 



staining diseased tissues, 466 



starch stored in, 563 



stem-structure of secondary tu- 

 mors in leaves, 428, 429 



strains (several) of organism caus- 

 ing, 457 



sugar abundant in, 563 



tracheids in, from stem-, leaf- and 

 fruit-parenchyma, 431, 455, 463 



transn)ission of, 469 



tumor strand, figures illustrating, 

 418, 424, 425, 427 



tumor strands in sunflower, 449 



type of disease, 413 



when excessively vascular, 468 



where found on the plant, 421 



Crown gall, wound disease. 469 



young tissues produce largest tu- 

 mors, 417, 449 

 Cruciferous plants, black rot of, 145, 



(See Black rot of crucifers.) 

 Cryptogams, bacterial diseases of, 4 

 Cucumber, angular leaf spot of. (See 

 Bacterium lachrymans Smith and 

 Bryan.) 

 Cucumber wilt, 132. (See also Bacillus 

 tracheiphilus.) 



carried by striped beetles, 30 



etiology, 132 



geographical distribution, 132 



literature, 145 



type of disease, 132 



winter occurrence of, 132 

 Cucurbit wilt 



controlled by destruction of insects, 

 74 



figures illustrating, 133, 134, 135 



histology of, figures illustrating, 

 141, 142, 143 

 Cultures of bacteria, care of, 80, 109 



isolation of, 80 



staining of, 118 



study of, 110 



tools for isolation of, 80 



transfer chambers for making, 80 

 Culture media, 



agar, 105 



blood serum, 105 



bouillon, 105 



gelatin, 105 



milk, 104 



peptone water, 106 



preparation of, 77, 100 



pure sugars for, 107 



raw vegetables, 103 



steamed vegetables, 101 



synthetic, 106 



uses of, 99 



vegetable juices, 103 

 Cuttings, disease transmitted by, 73 

 Cyanide of mercury for pear blight, 71 



DAcusoleae (Rossi) Meigen, 407, 411 

 Dark room, for photography, 95 

 Denmark, bacterial diseases found in, 

 62 



