20 Bugs, Butterflies, and Beetles 



would be hardly less crude, however, than that 

 strange creature we find just below low-tide mark, 

 called a " sea-squirt " by the boys and an Ascidian 

 by the school-teachers ; but as this book is not about 

 worms or sea-squirters, we are not interested in 

 these things at present beyond the fact that we 

 begin with this form of life only because it is very 

 simple and easily understood. In fact, it is so 

 simple that it would be hard for us to tell which is 

 the head and the tail of the wax-worm just made. 



3 



But do not let this worry you because our wax- 

 worm does not differ in this respect very greatly 

 from some forms of real live things. In order to 

 make our wax-worm look like a caterpillar, we will 

 tie a number of threads about its body (Fig. 3). 

 The first section we will call its head, the next sec- 

 tion, which we have made bigger than the head, 

 we will call its shoulders or chest and the other 

 sections we will call its body, belly or paunch. 

 We are making believe that the fairy has given 



