CONTENTS 



PAGE 



PREFACE v 



SYNOPSIS ix 



INTRODUCTION 1 



CHAP. 



* I. THE SCOPE OF THE ENQUIRY ... 3 



II. CONDITIONS MODIFYING THE CHARACTERS 



OF BACTERIA 13 



III. A CONSIDERATION OF THE EVIDENCE . 28 



IV. VARIATIONS IN MORPHOLOGY ... 37 



V. VARIATIONS IN FERMENTING POWER . 50 



VI. VARIATIONS IN VIRULENCE . . . . 71 



VII. VARIATIONS IN PATHOGENIClTY . . . 94 



VIII. THE POSSIBLE OCCURRENCE OF TRANS- 

 MUTATION IN THE LIVING BODY . . 107 



IX. SUPPOSED INSTANCES OF TRANSMUTATION 



BROUGHT ABOUT EXPERIMENTALLY . .116 



X. SUMMARY 140 



XL THE ENZYME THEORY OF DISEASE . . 153 



XII. CONCLUSIONS 170 



APPENDIX. REFERENCES . 171 



ao 



