IV CONTENTS 



Sections — Continued: 

 Soil Science: 



General Entries 1630-1639 



Influence of Biological Agents Entries 1640-1648 



Soil Acidity Entries 1649-1659 



Fertilization Entries 1660-1673 



Soil Classification Entries 1674-1680 



Peat and Muck Entries 1681-1684 



Miscellaneous Entries 1685-1689 



Taxonomy of Vascular Plants Entries 1690-1780 



Miscellaneous, Unclassified Publications Entries 1781-1853 



Index to Authors' Names appearing in volume IV Page 275 



