as fins or legs for oaring 

 water. 



THE SALMON FAMILY. 331 



their passage through the 



LARVA. 



CHRYSALIS. 



FLY. 



When the time arrives for the transformation of the 

 loathsome grub into the brilliant and delicate May-fly, the 

 insect crawls up from the mud in which its hole is bored 

 by the stem of the nearest rush or water- weed, on which it 

 rapidly casts the disfiguring slough, dropping its eggs into 

 the water as it rises from the surface for its first flight. 

 The eggs, from their specific gravity, sink to the bottom, 

 to furnish in another year a new swarm of destroyers for 

 the Trout eggs, and again, when their turn comes, a fresh 

 supply of food for the survivors of their depredations. 



The voracity of the Trout when in pursuit of its favourite 

 food sometimes leads to curious results. Dr. Gillespie 

 once saw a Swallow from above and a Trout from below 

 dart upon the same May-fly : down came the Swallow, and 

 up came the open mouth of the Trout, into which, in pur- 

 suit of its prey, the Swallow pitched its head. The struggle 

 to get separated was short, but severe ; and the Swallow was 



