CHAPTEK V. 



THE GREAT CHANGE. 



WE must now spend a short time in narrating 

 the particular circumstances which attend this 

 interesting event; the extrication of the insect 

 from its pupa case. We shall, in the first place, 

 speak of such pupae as are not aquatic, and, after- 

 wards, of the singular ones which are so. In the 

 case of the butterfly, which, as we have recom- 

 mended repeatedly its being nursed and bred, it 

 will be expedient to mention first, the extrication 

 of the insect is, comparatively with some others, 

 a very simple operation. The insect within is 

 seen to struggle for a time, twisting its body in 

 various ways, until at length a longitudinal slit 

 appears down the middle of its thorax. The slit 

 extends gradually along the head, and down the 

 parts which compose the breast, until the insect 

 emerges from the outer case. The inner mem- 



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