AND THE LOWER ANIMALS. 59 



of too pliant a character to support the body ; the 

 wings are heavy, thrown into microscopic zigzag folds, 

 and unfit for night; and the proboscis, with its com- 

 ponent halves often separate, is extended in a right 

 line. But after a while the surrounding liquids are 

 evaporated, the limbs are strengthened, the pro- 

 boscis is adjusted and coiled up, the wings are un- 

 folded, and the insect, which in its early days was 

 " a creeping thing," and afterwards a motionless 

 one, flies to the nearest flower and makes its first 

 repast. 



We shall now describe in a few words the being 

 produced from the little worm which sprung from the 

 Pieris' egg. 



The body, which is entirely clothed with hairs per- 

 ceptible to the naked eye, consists of three segments, 

 which are separated from each other by well-marked 

 constrictions ; these three are : the head, the chest or 

 thorax, and the belly or abdomen. The head is small, 

 and has attached to it in front two long, horny, 

 jointed, club-shaped feelers or antennce, which had no 

 existence in the caterpillar. The little simple eyes are 

 still present ; but in addition, a large round mass with 

 a trellised surface may be seen on each side. These 

 masses are the compound eyes, each facette of which is 

 a true organ of vision ; and since, according to the cal- 

 culations of several naturalists, there are no less than 

 thirty thousand of these facettes, it follows that the 

 animal has this enormous number of distinct eyes. 

 The mouth, which now, instead of being used for divi- 

 sion and mastication, is only employed for suction, is 

 admirably adapted to its new office. We can hardly 

 find a trace of the upper and lower lips or of the man- 



