78 



BOYS AND GIRLS IN BIOLOGY. 



warm weather. Some of these days when you are thus 

 wading, if you will take up a piece of the duck-weed 

 you find in the water, you may see a number of slender, 

 green, brown, or orange-colored things, about half an 

 inch long, hanging down from the weed (Fig. 77). If 

 you shake or touch them the least bit they will get 

 sulky, and shrink all up against the stem (Fig. 77), look- 



Fig. 78. 



2 



Hydra fishing for Food with its Feelers, or Tentacles. 



ing like little pouting lumps of jelly. Place your bits 

 of weed in a glass of water, and put the glass in the 



