100 ELEMENTS OF AGRICULTURE 



QUESTIONS 



1. How are soils formed? 



2. How do the soil particles become small? 



3. Do stones "grow"? Why, then, are there more large ones to be 

 picked from stony land every few years? 



4. Which fall faster in the air or water, large particles or small 

 ones of the same material? Why? Describe the material in the bed 

 of a stream in its upper, middle and lower courses. Why this difference? 

 Why do raindrops fall faster than the fog? 



5. What soil maps has the Bureau of Soils made in your state? 

 From these can you identify any of the soils in your region? 



6. What is the relative surface area of a one-foot cube of stone and 

 of the same stone divided into one-inch cubes? 



7. What is the name of the force that holds the film of water on 

 a piece of glass? What liquid does not stick to glass? 



8. Why does wet clay stick to one's shoes? 



9. How did the Jews make brick in Egypt? Would a dry soil make 

 brick? Apply these principles to tillage. 



10. What is the difference in taste of well water and rain water? 

 Why? 



11. How often should house plants be watered? How much should 

 be applied each time? 



12. Which is better, to water a flower-bed a little every day, or 

 to give it more water less frequently? Why? 



13. What crops of your region will grow best in wet seasons or on 

 wet lands? Which ones will stand more drought? 



14. What has Holland done to increase the area of farm land? 

 How productive is this soil? 



15. What human diseases would be decreased if our marshes were 

 drained? Why? 



16. What is a "dead furrow"? Why so named? 



17. What is the difference in color of hillsides and bottom-land 

 soils? Why? 



18. If a bacterium divided into two every fifteen minutes, how 

 many would there be at the end of four hours? How many at the end 

 of a day? 



19. What makes bread rise? 



20. Where does a fence-post rot most rapidly? Why? 



21. The statement is sometimes made that "tillage is manure." 

 Why? 



