AN EVENING AT THE MICROSCOPE. 185 



another time be sought in vain, although there is 

 apparently no reason for its disappearance. 



Now look at it through this half-inch objective. 

 Did you ever see anything more lovely? Watch 

 that gracefully rolling sphere as it slowly revolves 

 on its axis across the field of view ; notice its 

 delicate tracery forming the boundary lines of six- 

 sided cells ; observe the profusion of pear-shaped 

 dots from whose apices are projected those very 



"V 



FIG. 45. Volvox globator. 



fine gossamer-like hairs, or cilia, which penetrate 

 right through the outer envelope, and with swift 

 movement row the volvox along, and tell me whether 

 even Nature's casket contains any gems; more won- 

 drously fair. Within the globe are smaller globes. 

 With a higher magnification these are seen to be 

 growing vol voces, and -not infrequently there may 

 be found within these a third generation, all carrying 

 on their marvellous gyrations within the parent 

 cell. After a while the mother, or the grandmother, 



