REMARKABLE ORGAN. 



169 



all quit the bottom of the glass and attach them- 

 selves to its sides. 



Let us now examine more minutely this very 

 singular apparatus. By a 

 good lens we may readily 

 do this, as the organ is very 

 transparent, permitting its in- 

 ternal structure to be beau- 

 tifully seen. Placing the crea- 

 ture in a convenient position 

 for our examination, and in 

 a good light, it will be pre- 

 sently seen that the tail is 

 composed in reality of two 

 tubes, of which one slides up 

 and do\vn within the other, 

 just like the tubes of a tele- 

 scope (see cut). By this means 

 the larva is provided with an 

 instrument capable of being 

 made to reach to a great 

 length, and yet also pos- 

 sessing the capability of being packed up again 

 in a very small compass. The proper breathing 

 tube is the small inner one ; at its extremity is a 



The Tail magnified. 



