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UNIVERSITY OF CALIFORNIA—EXPERIMENT STATION 
4. Physical Phenomena and the Inorganic World 
Soil .—Review work of previous years as to origin of soil, different 
types., etc. The following outline is suggestive for a more detailed 
study: 
(1) Character of the Earth’s Crust. 
(2) Agencies in Soil Formation. 
(3) Physical Processes in Soil Formation. 
(4) Chemical Processes in Soil Formation. 
. (5) Successive Steps in Evolution of Soil. 
(6) The Major Soil-forming Materials. 
(7) Rocks as Soil Formers. 
(8) General Classification of Soils. 
(9) General Physical Constituents of Soils. 
(10) Leading Types of Farm Soils. 
(11) Organic Matter in Soils. 
(12) Soil Water. 
(13) Soil Air. 
(14) Soil Temperature. 
(15) Cultivation of Soil. 
(16) How Maintain Soil Fertility. 
(17) Importance of Crop Rotation. 
Physical phenomena .—Review previous grades and emphasize any 
new data that has direct relation to agriculture. 
