CONTENTS 



EXERCISES FOR SEPTEMBER 



EXERCISE PAG* 



1. DISTRIBUTION or SEEDS . .1 



2. A FIELD LESSON ON THE STUDY OF CORN .... 5 



3. A STUDY OF SOIL PARTICLES ....... 8 



4. A FIELD LESSON IN SOILS ....... 14 



5. THE INFLUENCE OF VEGETATION ON SOIL TEMPERATURE . 19 



6. A SOIL MOISTURE STUDY ........ 23 



EXERCISES FOR OCTOBER 



7. A SOIL MOISTURE STUDY (Continued} ..... 23 



8. THE RISE OF CAPILLARY WATER IN SOILS .... 30 



9. THE PERCOLATION OF WATER IN SOILS . . . .34 



10. THE WEIGHT OF SOIL PER CUBIC FOOT 40 



11. CAPACITY OF SOILS TO HOLD MOISTURE ..... 44 



12. SOIL DRAINAGE ........... 49 



13. SOIL MULCHES 53 



14. THE EFFECT OF UNDECAYED ORGANIC MATTER ON THE RISE 



OF SOIL MOISTURE ......... 59 



15. COLLECTING MATERIAL FOR STARTING PLANTS (FIELD LESSON). 63 



EXERCISES FOR NOVEMBER 



16. THE EARLY DEVELOPMENT OF THE WHEAT PLANT ... 66 



17. THE EARLY DEVELOPMENT OF THE RYE PLANT ... 71 



18. THE EARLY DEVELOPMENT OF THE CORN PLANT ... 75 



19. THE CORN KERNEL 79 



ix 



