212 FLASHLIGHTS ON NATURE 



themselves against winter cold as the aquatic 

 animals. 



In No. 3 you see a shoot of curled pond-weed 

 preparing to receive cold attacks at the approach 

 of autumn. You may perhaps have noticed for 



NO. I. THE GREAT POND-SNAIL IN SUMMER. 



yourself that almost all plants of stagnant waters 

 tend to be freshest and most vigorous at the grow- 

 ing end the upper portion ; while the lower and 

 older part is usually more or less eaten away by 

 browsing water beasties, or incrusted by parasites, 

 or draggled and torn, or water-logged and mud- 



