CONTENTS. 



INTRODUCTION. 



PAGES 



The Refraction of Light and the Microscope 17-22 



THE REFRACTION OF LIGHT : The Two Fundamental Laws of 



Refraction ; The Principles of Refraction by Lenses . . . 17-19 

 THE MICROSCOPE: The Simple Microscope; The Compound 

 Microscope ; The Lenses and Lens-systems of the Micro- 

 scope; The Care of the Microscope . . ..... 19-27 



CHAPTER I. 



The Fundamental Principles . . 28-42 



THE HISTORY OF BACTERIOLOGY ............. 28 



THE CLASSIFICATION OF COHN FOR BACTERIA 28 



THE DEFINITION OF BACTERIA 29 



THE MORPHOLOGICAL CLASSIFICATION OF BACTERIA : The 



Coccus; The Bacillus; The Spirillum 30 



THE SIZE OF BACTERIA 33 



THE REPRODUCTION OF BACTERIA: Fission; Spdrulation . . 33-34 



THE MOTILITY OF BACTERIA 36 



THE RELATION OF OXYGEN TO BACTERIAL LIFE 37 



THE RELATION OF DEAD AND LIVING ORGANIC MATTER TO 



BACTERIA 37 



THE ESSENTIAL CONDITIONS OF BACTERIAL GROWTH : Heat ; 

 Moisture ; Decomposable Organic Material ; Special Chemi- 

 cal Reaction of the Culture-medium 37-39 



THE INERT AND INHIBITTVE CONDITIONS OF BACTERIAL LIFE 



THE VITAL MANIFESTATIONS OR FUNCTIONS OF BACTERIA . 39-42 



