EXERCISES 281 



3. Does the freezing of the ground in winter play any part in pre- 

 paring a "heavy" soil for plant growth? Why? 



4. Find out from some farmer or gardener what kind of a soil, sandy, 

 silty, or clayey, is best adapted to the growing of garden vegetables; of 

 corn; of grains like wheat and oats; of hay. 



5. Humus absorbs water more readily than clay does, and less 

 readily than sand. What advantage is there in having humus in a 

 soil? 



6. What is the economy of using the cream of milk for butter, and 

 feeding the skimmed milk to young stock, such as calves and pigs? 



7. What is the economy of having birds on a farm? 



8. Is there economy or waste in burning up the stubble of the farm? 

 Give both sides. 



