CONTENTS 



CHAPTER PAGE 



I. THE CELLS OF THE HUMAN BODY WHAT 



THEY ARE AND WHAT THEY Do . . I 



II. BACTERIA AND SOME OF THE THINGS WHICH 



THEY Do . . . . . .14 



III. How THE BACTERIA ARE STUDIED . . 28 



IV. SOME BACTERIAL CURIOSITIES ... 43 



V. AGRICULTURAL CONJURERS , . 55 



VI. BACTERIA AS MAN'S INVISIBLE FOES . . 60 



VII. THE BACTERIA OF WOUNDS AND OF SURGICAL 



DISEASES ...... 70 



VIII. THE BACTERIA OF CONSUMPTION OR TUBER- 

 CULOSIS ....... 83 



IX. TYPHOID FEVER AND ITS RELATIVES . . 100 



X. ASIATIC CHOLERA . . . . .109 



XI. PNEUMONIA, INFLUENZA, AND COLDS . 115 



XII. DIPHTHERIA AND TETANUS . . . 125 



XIII. A ROUND-UP OF UNDESIRABLES . . . 131 



XIV. SAFEGUARDS OF THE BODY AGAINST DISEASE. 141 



XV. How SCIENCE HELPS THE BODY IN INFECTION 155 



