CONTENTS 



CHAPTER PAGB 



I. THE CELLS WHICH COMPOSE THE HUMAN BODY 



WHAT THEY ARE, AND WHAT THEY Do . . i 



II. WHAT THE BACTERIA ARE, AND SOME OF THE THINGS 



WHICH THEY Do . . . . . . .14 



III. How THE BACTERIA ARE STUDIED . . . .25 



IV. SOME BACTERIAL CURIOSITIES . . . . .41 



V. THE BACTERIA AS MAN'S INVISIBLE FOES . , .52 

 VI. THE BACTERIA OF SURGICAL DISEASES - . . .59 

 VII. THE BACTERIA WHICH CAUSE CONSUMPTION, OR 



TUBERCULOSIS . . . .... . .70 



VIII. BACTERIA AND TYPHOID FEVER 84 



IX. THE RELATIONS OF BACTERIA TO ASIATIC CHOLERA . 90 

 X. THE RELATION OF BACTERIA TO DIPHTHERIA, PNEU- 

 MONIA, SCARLET-FEVER, ETC. . . . . .96 



XI. IMPURE FOOD AND AIR AS SOURCES OF BACTERIAL 



INFECTION ,..'.' . . . . . . 103 



XII. IMPURE WATER AND ICE AS A SOURCE OF BACTERIAL 



DISEASE 116 



XIII. THE END OF THE STORY OF THE BACTERIA . . 134 

 INDEX I 3g 



