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After the caterpillar has enjoyed itself 

 for some time on the apple-tree, and by 

 taking sufficient nourishment has arrived 

 at its full growth, the time approaches 

 when they put off their worm-like appear- 

 ance, and take on another very different 

 from this ; a work which no sensible man 

 can look at without the greatest astonish- 

 ment, it being done in the following 

 manner : the caterpillar takes no food for 

 more than twenty-four hours, but dis- 

 charges in this time all the excrements 

 contained in its body; they then quit their 

 social life, and each looks out for a con- 

 venient place on the tree where he may 

 shelter himself from the weather and 

 the sun ; it then fastens itself to this 

 place with a little of the web by the two 

 hind legs, so that the head looks down- 

 wards, and is bent in towards the belly. 

 After remaining in this state for a day 

 or longer, which depends on the weather, 

 its head swells, and the skin bursts and 

 rolls back. In a few minutes, it exhibits 

 a figure very singular, and different froni 



