170 



BOYS AND GISLS IN BIOLOGY. 



can help himself at all are, his little spinneret in front, 

 and the two very tiny hooks at the end of the tail. By 

 a strange " sleight-of-hand," that is, without any hands 

 at all, he fastens himself to some object by these two 

 little forks, and begins to work away with his little 

 spinning- jenny, to make a covering for himself. In a 

 very short time you see him hanging from a leaf in a 

 sort of silken hammock, like a sailor asleep. There 

 are two ways in which he slings his hammock : in one. 

 way he attaches himself by the tip of his tail, his head 

 hanging down (Fig. 139) ; in the other he fastens his 

 tail upon the leaf, and keeps his head from swinging 

 about by a band, or girdle, which he throws around the 

 upper part of his body (Fig. 140). The caterpillar, 



Fig. 140. 



Chrysalis, with Head fastened by a Sling. 



before he enters the hammock, is called a larva, which 

 means mask ; of course, when the butterfly is crawling 

 about as a worm, he is in disguise. This is the butter- 



