PAGE 



XJi TABLE OF CONTENTS. 



CHAPTER XVII 



A HAY INFUSION. 



General account. Results of microscopical examination. Turbidity. 

 Odor. Color. Constituents. The scene of important physical, 

 chemical, and biological phenomena. Previous history of the hay 

 and the water. Effect of bringing them together. Causes of tur- 

 bidity, color, odor, etc. Aerobic and anaerobic bacteria thrive. 

 Infusoria multiply and devour them. Carnivorous infusoria attack 

 the herbivorous. The struggle for existence. Hay a green plant 

 and the source of food. Quiet finally supervenes. How nutritive 

 equilibrium may be preserved or disturbed. The hay-infusion an 

 epitome of the living world ....................................... 



APPENDIX. 

 SUGGESTIONS FOR LABORATORY STUDIES AND DEMONSTRATIONS. 



Books for the laboratory. Time required for General Biology ....... ---- 205 



Special suggestions for laboratory work, etc., upon the subjects treated 

 in the several chapters as outlined above, viz.: 



Chapter I. Introductory ..................................... 205 



II. Structures of Living Organisms .................... 206 



III. Protoplasm and the Cell ............................ 307 



IV. -VIII. The Earthworm ............................. 210 



IX.-XI. The Fern .......................... . .......... 213 



XII. Amoeba ........................................... 216 



XIII. Infusoria .......................... . .............. 217 



XIV. Protococcus ....................................... 220 



XV. Yeast ............. . .............................. 221 



XVI. Bacteria ........................................... 223 



XVII. A Hay Infusion ................................... 223 



INSTRUMENTS AND UTENSILS ......................... .............. 220 



REAGENTS AND TECHNICAL METHODS ................................. 221 



INDEX .............................. ...... .................... .. 227 



