XVI LIST OF ILLUSTRATIONS 



Page 



26. A. Crystals formed by Biicterium lachripnans. B. Ditto by Bacterium 



solanacea'-itm 40 



27. Ardisia leaf showing; swollen serratures occupied by bacteria 41 



28. Bacterial cavity in leaf-tooth of Ardisia 41 



29. Like figure 28, but showing the water-pore 42 



30. A. Leaf of Pavetta ongustifolia from Java showing knots. B. Same 



without knots 42 



31. Cross section of fig. 30.1 in vicinity of a nodule 43 



32. Bacterial cavities in leaf-knot on Pavetta angustifolia 43 



33. Detail from another nodule in same series as figure 32 44 



34. Bacterial masses from nodule on leaf of Pavetta angustifolia 45 



3o. A. O'Gara's disease in head of western wheat grass. B. The same 



showing a knee-shaped bending of the culm. C. D. Hutchinson's 



East Indian (Punjab;* wheat disease 47 



36. Shoots developing from the middle of a healthy tomato leaf 50 



37. Schizomycete of Japanese basket-willow disease — Agar plate colony 



showing internal structure when viewed by oblique light 53 



38. Kernels of wheat (No. 271A, Kansas, 1917) attacked and shriveled 



by the black chaff bacterium 56 



39. Head of wheat from Kansas (No. 478) showing the basal glume rot 



due to Bacterium atrofaciens. McCulloch 57 



40. Glumes and kernels of wheat attacked by the basal glume rot 58 



41. Citrus canker on grape fruit leaves [due to Bacterium citri (Hasse) Jehle]. 



Fully developed 59 



42. Citrus canker on grape fruit leaf. Early stage 60 



43. Citrus canker on stems 61 



44. Section through a young bacterial canker on a grape fruit leaf 62 



45. Costa Rican pseudo-canker of citrus 63 



46. Costa Rican pseudo-canker of citrus. A detail from figure 45 64 



47. Scab on Florida citrus leaf due to Cladosporium citri 65 



48. Bacterial citrus canker enlarged to show the translucent border surround- 



ing old leaf-scabs 66 



49. Celery rot, due to Bacillus apiovortts VVormald 67 



50. A. Kernels of wheat developing Bacterium translucens var. undulosum 



on nutrient agar. B. The same freed from the black chaff bacteria by 



formaldehyd 70 



oL Braun's new seed-wheat treatment, less harmful to the grain than 



ordinary treatments 72 



52. Electric centrifuge 79 



53. Freezing microtome 82 



54. Electric warm-plate 83 



55. Zeiss photomicrographic stand and small ui)right camera 85 



56. The Rutter kettle and other apparatus of the sterilizing chamber 87 



57. Simple home-made device for steaming infected soil 88 



58. The Crandall Model View Camera, 314 by 41-4 inches 91 



59. Camera stand recommended by the writer 93 



60. Horizontal view of figure 59 93 



6L Diagram of photographic room and dark room used by the writer 96 



62. Cucumber plant wilted by Bacillus tracheiphilus EFS 133 



