TABLE OF CONTENTS 



PAGE 



PREFACE v 



CHAPTEK I. 



INTRODUCTORY. 



Vegetation. Soils. Manures. Plants : Composition Sources of con- 

 stituents Sand cultures Water cultures. The atmosphere : 

 Constituents Oxygen Nitrogen Water vapour Carbon 

 dioxide Impurities Bain water p. I 



CHAPTER II. 



THE ORIGIN OF SOILS. 



Minerals : Magnetite Haematite Limonite Pyrites Eluorite 

 Calcite Gypsum Apatite Quartz Olivine Mica Leucite 

 Augite Hornblende Felspars Nepheline Kaolin Zeolites 

 Chemical composition of minerals Composition of the crust 

 of the earth. Rocks : Igneous rocks Aqueous rocks Glaciation 

 Weathering Denudation Organic rocks Stratification 

 Sand Clay Shale Marl Limestone Peat. Summary : 

 Formation of soils Classification p. 18 



CHAPTEE III. 



PHYSICAL PROPERTIES OF SOILS. 



The particles : Size Number Arrangement Interspace Internal 

 surface Mass. Moisture : Precipitation Hygroscopy Deli- 

 quescence .Capacity Retention Capillarity Percolation 



