OUTLINE AND TABLE 

 OF CONTENTS 



PAGE 



A.. The Soil as a Medium for Root-Development 1 



1. The rock and its products 2 



I. The elements of plant-food 3 



a. Elements essential to plant-growth (1).* 



b. General abundance of plant-food elements (2). 



II. Important soil-forming minerals 4 



a. Soil-forming minerals, their composition and 



properties (3). 



b. Relative abundance of common minerals (4). 



III. Important soil-forming rocks .' 9 



a. Igneous, Aqueous, iEolian and Metamorphic 

 rocks (5). 



IV. Chemical and physical agencies of rock decay. ... 14 



a. Atmosphere (6). 



b. Heat and cold (7). 



c. Water (8). 



d. Ice Glaciers (9). 



e. Plants and animals (10). 



V. Geological classification and chemical composition 



of soils 30 



a. Sedentary soils (11). 



(1) Residual (12). 



(2) Cumulose (13). 



b. Transported soils (14). 



(1) Gravity or Colluvial (15) 

 f (2) Water (16). 

 j (a) Marine soils (17). 



(b) Lacustrine soils (18). 



(c) Alluvial soils (19). 



(3) Ice Glacial soils (20). 



(4) Wind iEolian soils (21). 

 Number in parenthesis refers to section 



(xi) 



