8 LIST OF ILLUSTRATIONS. 



FIGURE PAGE 



26. Soil bacteria which produce nitrification . . . 103 



27. Soil bacteria which produce tubercles on the toots of 



legumes IO8 



28. Diphtheria bacillus 134 



29. Tetanus bacillus 135 



30. Typhoid bacillus ....... 136 



31. Tuberculosis bacillus 137 



32. Anthrax bacillus 138 



33. White blood corpuscles and other phagocytes . . 152 



34. Malarial organism 161 



