112 ELEMENTAKY AGKICULTUEE 



painted, so tliey will last longer and save the farmer 

 from buying new ones early. Use plenty of oil to 

 save wear on all machinery. Oil and paint cost 

 money; but if thirty-five cents' worth of paint will 

 make a thirty-five-dollar machine last several years 

 longer, it pays to use the paint. 



QUESTIONS 



(1) Who was Jethro Tull and what do we owe to him? 

 (2) What do we mean by saying that plant food must 

 be in the right form? (3) How may a farmer save the 

 moisture in his soil for the crop? .(4) What is meant 

 by a dust mulch? (5) What is dry farming? (6) In 

 what different ways is water obtained for irrigation? (7) 

 What are the objections to copper tools? (8) In what 

 way is bronze better for tools? (9) Why was it so long 

 before iron tools were made? (10) What invention do 

 you think has meant most to the farmer? (11) Why? 



For exercises, problems and experiments, refer to the 

 Appendix. 



