18 ILLUSTRATIONS 
31. The anthrax bacilli showing spores.164 
32. Diphtheria bacilli.169 
33. Pseudodiphtheria bacilli.171 
34. Tubercle bacilli, human.174 
35. Leprosy. Section of skin.177 
36. The smegma bacillus.178 
37. Influenza bacilli.181 
38. Bacillus pestis.181 
39. Spirillum cholerae.182 
40. Various types of spirochetae.188 
