220 LIFE AND HER CHILDREN. 
and fall in and out in a mazy dance ; for they have 
but a few hours to live, and their mouths are too soft 
for them to take food. In fact, the whole end and 
aim of their winged life is to form and lay eggs in 
Fig- 75- 
May-fly * and Caddis-fly, t Life size. 
mg, May-grub, with its fringe of breathing gills ; mf, May-fly ; 
eg, caddis-grub in its case ; cf, caddis-fly. 
little packets on the water to hatch into future young 
ones. And yet they are not really mere " creatures 
of a day " as they have been called, for before they 
* Ephemera. t Phryganea. 
