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GAINS FKOM KNOWLEDGE 221 



More than this, as soon as man had learnt to 

 till the ground, he had to learn the deeper lesson 

 of not only making it yield of its strength, but 

 also of making sure that there was a reserve of 



FIG. 48. Cutting and binding Oats in Ontario. 



strength for the future. He has had to learn what 

 his crops are taking from the land, in order to 

 learn what he must give back to the land. He 

 has had to learn to take advantage of the tiny 

 bacteria on the roots of clover and peas in order 

 that his corn crops may not fail. He has had to 



