260 



INDEX 



W 



Water, movement of, in soil, 10-11 

 Water-soluble constituents of plants, 



77 

 Water supply to plants, 11 

 Weathering of rocks, 2-6 



Worms in soil, 39-40 

 Y 

 Z 



Yeasts, 34 



Zygorhynchus, 33 



