TABLE OF CONTENTS 
PART I 
GENERAL NATURE OF MICROORGANISMS AND THEIR ACTIVITIES 
CHAPTER 
I. 
II. 
. Nature’s Food Supply. The Carbon Cycle 
. Decomposition of Nitrogenous Compounds... .... 
. Nitrification and Denitrification 
. The Manure Heap and Sewage 
. Reclaiming Lost Nitrogen 
. Bacteria and Soil Minerals. . . 2... 2... 2... 
. Some Practical Lessons from Soil Bacteriology 
. Bacteria in Water 
. Bacteria in Milk 
. Control of the Milk Supply 
. Bacteria in Butter-making 
. Bacteria and other Microérganisms in Cheese-making. . 
The General Characters of Microérganisms. . . .... 
Fermentation, Putrefaction, and Decay 
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PART II 
BACTERIA IN SOIL AND WATER 
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PART Ill 
BACTERIA IN Dartry PRODUCTS 
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