LIST OF ILLUSTRATIONS. XXI 



FIG. PAGE 



33. Simple Warm Stage shown in Operation . . 99 



34. Schafer's Warm Stage ....... 100 



35. Strieker's Warm Stage . . . . . loo 



36. Section of Israel's Warming Apparatus and Drop-culture Slide . 101 



37. Israel's Warming Apparatus . . . . . . 101 



38. Israel's Warming Apparatus in Operation .... 102 



39. Simple Gas Chamber . . . . .103 



40. Gas Chamber in use with Apparatus for generating Carbonic Acid . 104 



41. Strieker's Combined Gas Chamber and Warm Stage . . -105 



42. Simple Moist Chamber adapted for transmission of Electricity . 105 



43. Apparatus arranged for transmitting Electricity . . .106 



44. Slide with Gold-leaf Electrodes . . . . .106 



45. From a Preparation of Bacillus anthracis . . . .119 



46. Ascococcus Billrothii, x 65 (after Cohn) . . . .122 



47. Streptococcus and Sarcinacoccus from a Drop-cultivation, x 1200 . 123 



48. Streptococcus in the Blood of a Rabbit, x 1200 . . . 123 



49. Streptococcus of Progressive Tissue Necrosis in Mice (after Koch) . 123 



50. Spirochaeta from Sewage Water, x 1200 . . . .125 



51. Bacteria showing Flagella . ...... 127 



52. Bacillus megaterium . . . . . . .129 



53. Clostridium biityricum, x 1020 . . . . .130 



54. A Thread of Bacillus anthracis with Spores in a Drop- cultivation, 



x 1400 ........ 131 



55. Leuconostoc Mesenteroides ; Cocci-chains with Arthrospores (after 



Van Tieghem and Cienkowski) . . . . . 131 



56. Spores of Bacillus anthracis, stained with Gentian Violet, after 



passing the cover-glass twelve times through the flame, x 1200 . 133 



57. Spore-bearing Threads of Bacillus anthracis, Double-stained with 



Fuchsine and Methylene Blue, x 1200 . . . . 133 



58. Tubercle Bacilli in Sputum, x 2500 (from photographs) . . 135 



59. Leprosy Bacilli from a Section of Skin, x 1200 . . . 135 



60. Glanders Bacilli from a Section of a Glanders Nodule, x 1200 . 135 



61. Bacterium of Chicken-cholera from Blood of Infected Hen, x 1200 . 136 



62. Bacterium of Chicken-cholera from Muscle Juice of an Infected Hen, 



x 2500 (from a photograph) . . . .136 



63. Comma Bacilli in Sewage Water stained with Gentian Violet, x 1200 136 



64. Vibrios in Water contaminated with Sewage, x 1200. . . 137 



65. Spirillum undula, x 1200 . . . . . . 137 



66. Cladothrix dichotoma . . . . . . .184 



67. Bacterium pneumonia crouposce, x 1500 (after Zopf) . . .189 



68. Emmerich's Bacterium, x 700 (after Emmerich) . .. 190 



