OUTLINE AND TABLE OF CONTENTS XIX 



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(e) Factors affecting the values of manures (244). 



(1) Age of animal (245). 



(2) Food of animal (246). 



(3) Use of animal (247). 



(/) Deterioration of farm manure (248). 



(1) Fermentations (249). 



(2) Leaching (250). 



(g) Methods of handling (251). 

 (h) Place in rotation (252). 

 (i) Functions (253). 

 6. Green manures (254). 



(a) Leguminous crops (255). 



(b) Cereal crops (256). 



D. Organisms in the Soil 388 



I. Macro-organisms of the soil 388 



a. Rodents (257). 



b. Worms (258). 



c. Insects (259). 



d. Large fungi (260). 



e. Plant-roots (261). 



II. Micro-organisms of the soil 391 



a. Plant micro-organisms (262). 



1. Plant micro-organisms injurious to higher plants 



(263). 



2. Plant micro-organisms not injurious to higher(264). 



3. Bacteria (265). 



(a) Distribution (266). 



(b) Numbers (267). 



(c) Conditions affecting growth (268). 



(1) Oxygen (269). 



(2) Moisture (270). 



(3) Temperature (271). 



(4) Organic matter (272). 



(5) Soil acidity (273). 



(d) Functions of soil bacteria (274). 



(1) Decomposition of mineral matter (275). 



