IV] 



FROM WATER TO AIR 



31 



a few months, the dragon-flies, having paired and laid 

 their eggs, die before the approach of winter. 



The life-story of a may-fly follows the same general 



Fig. 3d. Dragon-fly (Aeschna cyanea] with expanded wings. 



course as that just described for the dragon-flies; but 

 there are some suggestive differences. In the first 

 place, we notice a wider divergence between the 



