Xviii ILLUSTRATIONS 



FIG. PAGE 



41. Species of Aspergillus 62 



42. Aspergillus oryzse 63 



43. PeuicLLlium 64' 



44. Penicillium 65 



45. Trichothecium 66 



46. Hormodendrum and Cladosporium 67 



47. Alternaria 67 



48. The effective range of indicators most commonly used in 



the bacteriological laboratory 95 



49. Diagrammatic representation of the optics of the oil im- 



mersion lens 106 



60. Lactic acid bacteria 195 



51. Acetobacter 211 



52. Crystals of calcium oxalate in medium in which Aspergillus 



is growing 218 



53. Clostridium 224 



54. Aspergillus oryzae 226 



55. Outline of nitrogen cycle 240 



56. Nitrosomonas 244 



67. Rhizobium leguminosarum 261 



58. Nodules on roots of a leguminous plant 254 



59. Section of nodule of root of leguminous plant 255 



60. Agglutination 291 



61. Phagocytosis 297 



62. Streptococcus pyogenes 311 



63. Staphylococcus aureus 318 



64. Diplococcus pneumoniae 323 



65. Neisseria meningitidis .■ 329 



66. Bacterium coli ,. 334 



67. Bacteria T 337 



