6Action of Plants and their Remnants in Soil Formation.
46PHYSICAL AND CHEMICAL CONDITIONS OF PLANT GROWTH.
7INFLUENCE OF RAINFALL ON SOIL FORMATION; LEACHING OF THE LAND.
47THE SOLVENT ACTION OF WATER UPON SOILS.
8SILICATE MINERALS.
48ASCERTAINMENT OF THE IMMEDIATE PLANT-FOOD REQUIREMENTS OF CULTIVATED SOILS BY PHYSIOLOGICAL TESTS. PHYSIOLOGICAL SOIL-ANALYSIS.
9CALCITE AND LIMESTONES.
49CHEMICAL TESTS OF IMMEDIATE PRODUCTIVENESS.
10GENERAL CLASSIFICATION OF ROCKS.
50LIMITS OF ADEQUACY OF THE SEVERAL PLANT-FOODS IN VIRGIN SOILS.
11Generalities regarding the Soils derived from various Rocks.
51INFLUENCE OF LIME UPON SOIL FERTILITY.
12“Colloidal” Clay.[17]
52DISCUSSION OF THE TABLE.
13(A.) MINERALS USED AS FERTILIZERS.
53The “Insoluble Residue.”
14(B.) MINERALS UNESSENTIAL OR INJURIOUS TO SOILS.
54Insoluble and Soluble Silica and Alumina.
15Clay as a Soil Ingredient.
55SOILS OF THE TROPICS.
16Rock Powder; Sand, Silt and Dust.
56SOILS OF SAMOA AND KAMERUN.
17WEATHERING IN HUMID AND ARID REGIONS.
57THE SOILS OF MADAGASCAR.
18PHYSICAL ANALYSIS OF SOILS.
58THE SOILS OF INDIA.
19CHAPTER VII. THE DENSITY AND VOLUME-WEIGHT OF SOILS.
59INFLUENCE OF ARIDITY UPON CIVILIZATION.
20CAUSES AND PROCESS OF DIFFERENTIATION. HUMUS.
60COMPOSITION AND QUANTITY OF ALKALI SALTS.
21THE ORGANIC AND ORGANIZED CONSTITUENTS OF SOILS.
61TOLERANCE OF VARIOUS CROP PLANTS.
22MICRO-ORGANISMS OF THE SOIL.
62Saltbushes, and Herbaceous Crops.
23DISTRIBUTION OF THE HUMUS WITHIN THE SURFACE SOIL.
63Tolerance of Shrubs and Trees.
24CHAPTER X. SOIL AND SUBSOIL (Continued)
64Deciduous Orchard Trees.
25HYGROSCOPIC WATER.
65Timber and Shade Trees.
26Capillary Water.
66INDUCEMENTS TOWARD THE RECLAMATION OF ALKALI LANDS.
27SURFACE, HYDROSTATIC AND GROUND WATER; PERCOLATION.
67NATURAL VEGETATION THE BASIS OF AGRICULTURAL LAND VALUES IN THE UNITED STATES.[184]
28ABSORPTION AND MOVEMENTS OF WATER IN SOILS.
68INVESTIGATION OF CAUSES GOVERNING THE DISTRIBUTION OF NATIVE VEGETATION.
29METHODS OF IRRIGATION.[89]
69VEGETATIVE BELTS IN NORTHERN MISSISSIPPI.
30QUALITY OF THE IRRIGATION WATER.
70SOIL BELTS IN SOUTHERN MISSISSIPPI.
31EVAPORATION.
71DIFFERENCES IN THE FORM AND DEVELOPMENT OF TREES.[188]
32EVAPORATION THROUGH THE ROOTS AND LEAVES OF PLANTS.
72EUROPEAN OBSERVATIONS AND VIEWS ON PLANT DISTRIBUTION AND ITS CONTROLLING CAUSES.
33DISTRIBUTION OF MOISTURE IN THE SOIL AS AFFECTED BY VEGETATION.
73Calciphile, Calcifuge and Silicophile plants.
34ABSORPTION OF SOLIDS FROM THEIR SOLUTIONS.
74THE VEGETATION OF ALKALI LANDS.
35ABSORPTION, OR CONDENSATION, OF GASES BY SOILS.
75RECLAIMABLE AND IRRECLAIMABLE ALKALI LANDS AS DISTINGUISHED BY THEIR NATURAL VEGETATION.
36THE COMPOSITION OF GASES ABSORBED FROM THE ATMOSPHERE BY VARIOUS SOLIDS.
76APPENDIX A.
37THE AIR OF SOILS.
77APPENDIX B.
38CHAPTER XV. THE COLORS OF SOILS.
78APPENDIX C.
39TEMPERATURE.
79INDEX.
40RAINFALL.
80AUTHORS REFERRED TO.
