DEVELOPEMENT OF INSECTS. 



305 



The egg, which is deposited by the butterfly, gives 

 birth to a caterpillar ; an animal, which, in out- 



145 



147 



ward shape, bears not the slightest resemblance 

 to its parent, or to the form it is itself afterwards 

 to assume. It has, in fact, both the external 

 appearance, and the mechanical structure of a 

 worm. The same elongated cylindric shape, the 

 same annular structure of the denser parts of its 

 integument, the same arrangements of longitudi- 

 nal and oblique muscles connecting these rings, 

 the same apparatus of short feet, with claws, or 

 bristles, or tufts of hairs, for facilitating pro- 

 gression ; in short, all the circumstances most 

 characteristic of the vermiform type are equally 

 exemplified in the different tribes of caterpillars, 

 as in the proper Annelida. 



But these vermiform insects have this pecu- 

 liarity, that they contain in their interior the ru- 

 diments of all the organs of the perfect insect. 

 These organs, however, are concealed from view 



VOL. I. X 



