THE BUTTERFLY. 183 



of the butterfly's proboscis, because the butterfly is a 

 honey-sucker and not a " beef -eater." Now come the 

 three pairs of feet on the breast, or thorax ; they are 

 not shaped as the lobster's, for they are not used in the 

 same way. The butterfly has no prey to catch and cut 

 up, and hence he needs no claws and no scissors. As 

 he does not swim, he needs no swimmeeets, or tail-fin. 

 Nature never gives an animal what is of no use to him. 

 The way in which the baby-butterfly casts off his old 

 clothes is very much like the way in which the young 

 lobster flits from his old house into his new one. So 

 much for the outward resemblance ; let us see if we can 

 find any likeness between the inside arrangements. 

 There is the digestive canal in each, consisting of the 

 gullet, stomach, and intestine, with the liver on each 

 side, running in a straight line from the head to the tail. 

 The nervous system is made on the same plan, and takes 

 the same direction in both. Each has a chain of nerve- 

 bunches, or ganglia, on the ventral or lower side of 

 the body, and each has a heart, or a dorsal vessel, which 

 takes the place of a heart, on the upper or dorsal side 

 of the body. The muscles of the lobster are attached 

 to the inside of his shell, so the muscles of the butterfly 

 are fixed to the walls of his somites. So we might very 

 well call the butterfly a land-lobster \ and the lobster a 

 water-butterfly, for there is just enough change in 



