ObsewaAons on the Pea Fly, yc. 323 



I have lately reason to recommend fresh oyster shells, 

 pulverized in the manner that plaister of Paris is pre- 

 pared for manure, put about the roots of peach and plum 

 trees &cc. as effectual in keeping oif the peach ZygcenUy 

 and also Cerambix which destroys apple trees. 



Quere, whether oyster shells powdered, would not 

 Idc found to be as good a manure, as plaister or lime? 

 perhaps more lasting, and less expensive as they could 

 be prepared with less labour and expence.'* 



W. B. 



