IV CONTENTS 



Temperature Relations Entries 453, 827-828, 1249, 1758, 2903-2907 



Radiant Energy Relations Entries 2908-2910 



Toxic Agents Entries 138-140, 454, 829-831, 1250, 1759, 2911-2914 



Electricity and Mechanical Agents Entries 1251, 2915 



Miscellaneous Entries 455-457, 832, 1252-1260, 1760-1762, 2916-2919 



Soil Science Entries 841-871 



General Entries 1763-1778 



Fertilization Entries 1261-1268, 1779-1792, 2939 



Fertilizer Resources Entries 1269-1270, 1793-1800, 2940-2942 



Biology Entries 1271-1275, 2930-2938 



Methods Entry 1276 



Soil Classification Entries 1277, 1801-1802, 2949 



Nitrification Entries 1803-1806 



Acidity and Liming Entries 2920-2926 



Alkali Salts Entries 2927-2929 



Fertility Studies Entries 2943-2948 



Moisture Relations Entries 2950-2953 



Miscellaneous Entries 1278-1280, 2954-2958 



Taxonomy of Vascular Plants: 



General Entries 1807-1815, 2959-3029 



Pteridophytes Entries 1281-1285, 1816-1821 



Sperm atophytes Entries 141-161, 1286-1323, 1822-1S42 



Miscellaneous, Unclassified Publications Entries 1843-1852, 3030-3061 



Index to Authors' Names appearing in volume III Page 447 



