THE LARVA 43 



colour, and it settles down for a long rest lasting till the following 

 May or June. 



When the whole operation of building is completed, lift up the 

 tumbler, and up will come the saucer too. The two are firmly 

 glued together by the substance secreted ; and the power of this as 

 a cementing material will be well illustrated if you endeavour by 

 mere pulling force to separate the two articles. 



The Puss is not the only caterpillar that works up a foreign 

 material with the contents of the spinning organs. There are 

 several others, in fact, that use for this purpose fragments of wood 

 or other parts of the food plants ; and a still larger number bind 

 together leaves, fresh or dead, or particles of earth or other matter. 

 Several such cocoons will be described in our accounts of 

 individual species in another chapter. We shall now devote a 

 little space to a few general remarks on the chrysalides and the 

 final metamorphosis of butterflies and moths. 



