Illustrations 



PAGE 



Fig. 10. TUBERCLE BACILLI .... 84 



Plate VI. TUBERCLES IN THE LUNG ... 86 



" VII. A TUBERCLE IN THE LUNGS : HEALED . 88 



" VIII. TUBERCULOUS CAVITIES IN LUNG . . 90 



IX. CULTURES OF THE TUBERCLE BACILLUS . 92 



X. A SNEEZE PLATE CULTURE ... 94 



Fig. ii. THE BACILLI OF TYPHOID FEVER . 101 



12. THE PNEUMOCOCCUS . . . .116 



13. BACILLUS DIPHTHERIA . . . .126 



14. TETANUS BACILLI .... 128 



Plate XI. LEUCOCYTES AND PHAGOCYTES . . 146 



Fig- 15- PHAGOCYTES AND VACCINES . . . 167 



Plate XII. A DIRTY HUMAN LUNG . . . 202 



" XIII. TRACKS OF A WANDERING "TYPHOID 



FLY" 214 



