68 OF THE INSECT IN ANOTHER STAGE. 



they cause the canker, which will be hereafter 

 described. 



FIRST DISCOVERY OF THE INSECT IN ANOTHER 

 STAGE. 



Par. 80. I have often discovered during 

 my practice among the apples, while removing 

 the cankered parts of the trees (which I was uni- 

 formly particular in doing) that a small maggot 

 or grub was to be seen in the part affected, but 

 I naturally concluded like others, more from 

 custom, (certainly not reflection,) that it merely 

 got there for shelter; but in June, 1822, by 

 accident, rather assisted by curiosity, the whole 

 mystery was disclosed. 



PARTICULAR OBSERVATIONS MADE IN 1822, 

 OF THE INSECT WHICH CAUSES THE CAN- 

 KER ITS BECOMING WINGED. 



Par. 81. It may be recollected by some of 

 my readers that the summer of 1822 was a 

 very fine one; and to that fine summer suc- 

 ceeded a very mild winter ; in the month of 

 June the white blight began to be very general. 

 This, I observed, as I was going through an 

 old apple quarter in the nursery which was 

 intended to be cleared the following autumn ; 

 and this quarter, which contained upwards of 

 twenty thousand apple trees, were now reduced 



