59 



informed me, that having observed all his 

 apple-trees became cankered at a certain 

 state of growth, he was induced to examine 

 the nature of the soil at the greatest depth 

 the roots had penetrated, and which he found 

 consisted of gravel. Not being willing to 

 give over the propagation of apple-trees, he 

 caused a pavement of bricks to be made on 

 the bed of gravel, which obliged the roots to 

 take a horizontal direction, and thereby pre- 

 vented their reaching the gravel, since which 

 they have been free from canker. 



