INDEX 



239 



Utah soil, gain in nitrogen, 153, 



154 



V 



Value of manure, 213 



Vitamins, 59 



Volcanoes, 75 



Voltaire, 4 



w 



Walcott, I 



Water, alkali content of, 225, 226 



Water, bacteria in, 14 



Water, influence on acid produc- 

 tion, 220, 221 



Water, influence on ammonifica- 

 tion, 219, 220 



Water, influence of dcnitrifica- 

 tion, 136 



Water, influence of nitrogen fixa- 

 tion, 224, 225 



Water, injurious action on soil, 

 225 



Water, in soil formation, 74 



Water, loss of nitrogen, due to, 



222 

 Water, plant food in, 223 

 Water, quantity in bacteria, 45 

 Water, requirements of bacteria, 



S6 



Water, requirements in nitrogen 



fixation, 16 1, 162 

 Waves, in soil formation, 75 

 Weigart, 7 



Weight of bacteria, 27, 28 

 Wigand, 158 



Wind in soil formation, 73 

 Wilson, 162 

 Winogradski, 9, I2i 

 Woronin, 158 



X 



X-ray on bacteria, 67 



Y 



Yeast defined, 14 



Yeast morphology, 34 



Yeast, nitrogen fixed by, 141 



