CONTENTS 



IX 



PART III 

 APPLIED MICROBIOLOGY 



AIR MICROBIOLOGY 

 Exercise 1. Quantitative Bacterial Analysis of Air . . . 



PAGE 



. 220 



WATER AND SEWAGE MICROBIOLOGY 



Exercise 1. Bacteriological Analysis of Water from a Source 



Suspected of Sewage Contamination 223 



Exercise 2. Bacteriological Analysis of Water Suspected of 



Sewage or Other Pollution 228 



Exercise 3. To Demonstrate the Efficiency of Chloride of Lime 



as an Agent in the Purification of Drinking Water . 236 

 Exercise 4. To Demonstrate the Efficiency of the Berkefeld 



Filter Candle as a Means of Water Purification . . . 238 



SOIL MICROBIOLOGY 



Exercise 1. To Test the Calalytic Power of Soil 239 



Exercise 2. A Comparative Study of the Number and Types of 



Microorganisms in Soil 241 



Exercise 3. To Illustrate the Effect of Aeration of Soils on the 



Activities of Microorganisms Contained Therein.. 245 



Exercise 4. To Demonstrate the Cellulose-decomposing Power 



of Aerobic Organisms Found in the Soil 246 



Exercise 5. To Illustrate the Anaerobic Decomposition of Cel- 

 lulose by Soil and Fecal Organisms 248 



Exercise 6. To Illustrate Nitrification in Solution 249 



Exercise 7. To Illustrate Denitrification in Solution 251 



Exercise 8. To Illustrate the Non-symbiotic Fixation of Nitrogen 

 by Soil Organisms and Isolation of Azotobacter 

 Through Its Mineral Food Requirements 253 



Exercise 9. A study of the Symbiotic Nitrogen-fixing Organisms 



of Legumes, Ps. Radicicola 256 



Exercise 10. To Demonstrate the Change of Insoluble Phosphates 

 to a Soluble Form Through the Agency of Micro- 

 organisms , 263 



