WONDERS OF POND LIFE. 171 



making sweeps with our nets as we walk around 

 the shores, gathering in not only plants, but green 

 forms of animal life, and hasten home to inspect 

 our booty. To enjoy a few of the interesting things 

 that we see in our walk, each one should be pro- 

 vided with a microscope. 



Hold up a vial to the light and look at those 

 little green balls, scarcely a thirtieth of an inch in 

 diameter, rolling round and round in the water, 

 like mimic worlds in space. Let us catch one or 

 two of them with your dipping tube, and place 

 them carefully in a single drop on the glass slide 

 or " live box." Now look down through the in- 

 strument, and see how large it has suddenly grown. 

 This is Vblvox glohator (rolling ball). It looks now 

 like a crystal ball, covered over with a delicate net- 

 work. At the corners of the meshes are seen 

 bright green specks, like small shining emerald 

 beads. We will screw on to the end of the tube 

 another object-glass, which seems to make this 

 revolving globe still larger, and find that these 

 green specks are not specks at all, but little club- 

 shaped bodies, each having two very fine hairs or 

 cilia, as they are called, attached to them, which 

 are continually moving, and which serve as paddles 

 to propel the globe through the water. 



