66 



to canker, upon the wall, than on stand- 

 ards. 



I have made a few trials of the relative 

 strength of different barks. For example, 

 the beurre, (yellow) an indifferent fear, but 

 a great bearer, and little given to canker ; 

 the French bergamot, a very fine pear, but 

 very shy bearer, frequently continues long 

 in an apparent healthy and luxuriant con- 

 dition, but almost totally barren. Taking, 

 then, the power of bark of the beurre for 

 1. that of the French bergamot will be 

 1,7142 fere, or as 7 to 12, almost a dupli* 

 cate ratio. 



But when the transverse bark, on which 

 the stricture chiefly depends, is taken by 

 itself, the difference will be found still 

 greater: thus, taking the power of the 



