ILLUSTRATIONS. 
FIG. PAGE 
1. —Anthrax bacilli. Spore formation and spore germina¬ 
tion ... 4 
2. —Different forms of bacteria . 7 
3. —Dry heat sterilizer . 19 
4. —Autoclave. 21 
5. —Gonorrheal pus, showing gonococci within a leucocyte.. 49 
6. —Diplococcus pneumoniae in the heart’s blood of a rabbit. 51 
7. —Typhoid bacilli showing flagella . 61 
8. —Stages of the Widal reaction . 66 
9. —Chart showing effect of vaccination in reducing typhoid 
fever in the U. S. Army . 67 
10. —Tetanus bacilli. Spore-bearing rods from an agar cul¬ 
ture . 75 
11. —Bacillus diphtheriae . 91 
12. —Organisms of Vincent’s angina, showing spirillum and 
fusiform bacillus . 93 
13. —Actinomyces hominis (lung) . 104 
14. —Microsporon furfur . 106 
15. —Trichophyton tonsurans . 107 
16. —Ameba coli. From dysenteric stool . 117 
17. —Treponema pallidum in smear from secretion of a fresh, 
hard chancre . 119 
18. —The tsetse fly . 12f 
19. —Plasmodium vivax, parasite of tertian fever . 123 
