74 SECOND CHANGE OF THE INSECT. 



DESCRIPTION OF THE FIRST CHANGE OF THE 

 VERY SMALL INSECT, ALLUDED TO IN PARA^ 

 GRAPH THE SEVENTY-NINTH, WHICH CAUSES 

 THE CANKER, AND BECOMES THE LARGE FLY. 



Par. 86. Those versed in natural history, 

 describe moths and all winged insects, to 

 have various changes before they become 

 winged, which is the last stage of their ex- 

 istence ; and I shall now state as plainly as 

 possible the manner in which this insect goes 

 through its different changes : it first enters a 

 crevice in the apple tree, where it begins to feed 

 on the inner rind, and the outside skin of the. 

 insect becomes a sort of dead substance, and 

 the inside contains a very small maggot or grub, 

 with a black head, which it puts out at one end 

 for food ; the dry skin is retained most probably 

 to keep it from the inclemency of the weather : 

 its colour is nearly the colour of the bark df 

 the tree, which makes it in this state almost 

 imperceptible ; but during the winter, this small 

 worm makes its way under the rind of the trees, 

 and there hangs by its head, feeding on the 

 juices of the rind. 



SECOND CHANGE OF THE INSECT. 



Par. 87. When they have cast this skin, 

 (which is quite tough, but as thin as possible,) 



