THE EPHEMERA. 45 



most grateful bait, and thus turn the fish's rapa- 

 city to its own destruction. 



But though the usual date of those flies is two 

 or three hours at farthest, there are some kinds 

 that live several days ; and one kind in particu- 

 lar, after quitting the water, has another case 

 or skin to get rid of. These are often seen in 

 the fields and woods, distant from the water ; but 

 they are more frequently found in its vicinity. 

 They are often found sticking upon walls and 

 trees ; and frequently with the head downwards, 

 without changing place, or having any sensible 

 motion. They are then waiting for the moment 

 when they shall be divested of their last incom- 

 modious garment, which sometimes does not 

 happen for two or three days together. 



PART III. 



, OF INSECTS OF THE THIRD ORDER. 



CHAPTER I. 



OF CATERPILLARS IN GENERAL. 



IF we take a cursory view of insects in general, 

 Caterpillars alone, and the butterflies and moths 

 they give birth to, will make a third part of the 

 number. Wherever we move, wherever we turn, 



