CONTENTS 



CHAPTER I 



Devclofment of Soil Bacteriology 



PAGES 



Discovery of Bacteria I 



Spontaneous Generation 3 



Soil Bacteriology 8 



CHAPTER II 



Bacteria and Their Role in Nature 



What are Bacteria? 12 



Where do Bacteria Occur? 14 



What are the Functions of Bacteria? 17 



CHAPTER III 



Shafe md Structure of Microorganisms 



Shape of Bacteria 23 



Variation in Form 24 



Reproduction 25 



Size and Weight 27 



Movement 28 



Cell Structure 30 



Spore Formation , 32 



Longevity of Bacteria 33 



Morphology of Yeast 33 



Molds 35 



CHAPTER IV 



Classification of Bacteria 



Method of Classification 3^ 



Nomenclature 37 



Difficulties with Bacteria 37 



Migula's Classification of Bacteria 38 



Classification of Society of American Bacteriologists 39 



