10 



potato field or corn field. Keep track of when you till it. Tell ns 

 the results in the fall. Of course you will use judgment ; one can 

 overdo anything. But tell us whether you think we are right in 

 believing that tliese three things — tillage, rotation, humus — are the 

 very foundation stones of good agriculture. If we were to add a 

 fourth it would be good business management ; but begin this season 

 for a new experience of tliese three, and let us know the results. 



We siiall be glad if those farmers who contemplate trying these 

 experiments in improving depleted soils, will write us so that we 

 may register their names. We shall be glad to help them if we can. 



L. II. BAILEY, Chief, 



JOHN W. SPENCER, Deputy Chief, 



Cornell Reading-Course Bureau, 



580 



