CONTENTS 



EXERCISE PAGE 



ALA Study of the Formation of Soils 1 



A 2. To Study the Composition of Soils 4 



A 3. To Study the Groups of Individual Soil Particles 6 



A 4. To Compare the Surface Soil with the Subsoil 8 



A 5. To Study the Relative Productiveness of Soil and Subsoil . . 10 



A 6. To Study the Individual Soil Particles 12 



A 7. To Determine the Amount of Organic Matter in Different 



Soils 14 



A 8. To Determine the Pore Space in Soils 17 



A 9. To Determine the Weight of Soil per Cubic Foot 20 



A 10. To Study Soil Granulation 22 



A 11. To Study the Effect of Freezing and Thawing upon Soil 



Granulation 23 



A 12. To Show lliat Some SoUs Can Hold More Water Than 



Others 25 



A 13. To Show That Plants Give Off Moisture through Their 



Leaves 27 



A 14. To Show the Effect of Soil Air upon Plant Growth 29 



A 15. To Show How the Temperature of the Soil is Affected by the 



Slope 31 



A 16. To Study the Necessity for Soil Drainage 33 



A 17. A Study of Warm and Cold Soils 36 



A 18. To Study the Operation of Tile Drains 38 



A 19. A Study of Soil Temperature 40 



A 20. To Demonstrate the Movement of Water in the Soil 42 



A 21. To Compare the Movement of Water through Different 



Soils. 44 



A 22. To Show the Effect of a Loose Surface upon the Rate at 



which the Rain Will Soak into the Soil 46 



A 23. To Study the Forms of Soil Moisture 48 



vii 



