18 



calm, cold weather, does not expand quick- 

 ly, and fall off as in dry, warm, windy wea- 

 ther, but rather curls together, and forms 

 a receptacle for the vermin, which, lodging 

 in it, corrodes, and kills the fruit whilst 

 setting. 



The canker will be found to be nothing 

 but decayed rotten bark, first occasioned, 

 generally, by the stricture of the bark not 

 allowing a free circulation of the juices, 

 which break out in pear and apple trees, as 

 the gum in the cherry, but not forming by 

 itself a solid substance, like the gum, escapes 

 common observation, at any part weaker by 

 nature or injury, and is afterw r ards increased 

 by these insects nestling and depositing their 

 ova in it. 



The usefulness of fruit for sick and heal- 



