TABLE OF CONTENTS 



XV 



Section 9. Examination of Milk for Molds and 

 Yeasts .... 



10. Examination for Leukocytes in Milk 



11. A Study of Groups of Bacteria in Milk . 

 The Bacteriological Examination of 



1. Quantitative Determination of Bacteria 

 and Spores in Soil 



2. A Study of the Peptonization of Proteins 

 by Soil Bacteria 



3. The Formation of Amido Compounds and 

 Ammonia 



4. The Formation of Nitrites from Ammonia 

 and Isolation of Nitrite Bacteria . 

 The Formation of Nitrates from Nitrites 

 and Isolation of Nitrate Bacteria . 

 The Assimilation of Free Atmospheric 

 Nitrogen and Isolation of the Bacteria . 

 The Reduction of Nitrates to Nitrites and 



Isolation of the Bacteria 



The Reduction of Nitrates to Free Nitro- 

 gen • • ■ 



Growing Legumes in Sand and in Sand 

 Inoculated with Legume Bacteria 



160 



160 



162 



Soil 



i6s 

 168 

 170 

 171 

 174 

 I7S 

 177 

 177 



178 



Part VII. Molds, Yeasts, Torulae, and Acetic-Acid 

 Bacteria 



Preparation of Culture Media . . . 



A Study of Molds 



A Study of Yeasts 



Examination of Baker's Yeast 

 Examination of Yeast of Salt-rising Bread 



A Study of Torulae 



A Study of Acetic-Acid Bacteria . . . 



Appendix 



Dilution Tables 



Table of Weights and Measures .... . . 



Table of Centigrade and Fahrenheit Thermometers . 



Index . 203 



Section 

 Section 

 Part VI. 

 Section 



Section 



Section 



Section 



Section 



Section 



Section 



Section 



Section 



S- 



6. 



8. 



Section 

 Section 

 Section 

 Section 

 Section 

 Section 

 Section 



181 

 182 

 185 

 190 

 191 

 192 

 192 



197 

 ig8 

 198 



