30 



VIEWS OF THE MICROSCOPIC WORLD. 



field of existence, and soon a new generation of revolving monads issues from their 

 parting spheres ; to become, in their turn, the parents of other globes, and so on 

 in a countless series. 



Fig. 15. 



This process of increase is exhibited in figure 15, where 

 the offspring are shown issuing from the parent sphere, and 

 within each of the smaller globes another incipient race of re 

 volving monads is detected. The full sized globes are one- 

 thirtieth of an inch in diameter, and the size of the smallest, 

 when liberated from the parent, is one-three hundred and 

 sixtieth of an inch. 



In figure 16 is delineated a portion of a globe with 

 five individuals, and a cluster of six young monads at 

 a ; they are all attached to the spherical case, and to 

 each other, and the bands which connect them to 

 gether, as well as their respective organs of motion, 

 are distinctly seen. 



In figure 17 a single monad of a revolving globe, sepa 

 rated from its case, is magnified two thousand times; or, 

 in other words, covers upon the paper a space four million 

 times greater than its natural extent. In this engraving, 

 the two cilia are seen at b, 6, the six uniting threads at 

 c, c, c, c, c, c, and the eye-speck of the monad, which is 

 of a bright red, is situated at d. The natural size of a 

 single organism is the thirty-five-hundredth part of an 

 inch. The revolving globe is a common species of pro- 

 tophyte, and is easily found in the clear shallow waters of 

 brooks and ponds. 



RAY-GLOBE VOLVOX. Another kind of rolling organisms is delineated in figure 

 Fig. 18. 18. It is called the Hay- Globe Volvox, and the individuals 



form, by their union, a group resembling the clustering fruit 

 of the banana. Each organism is enclosed in a cell, and the 

 cells of the cluster are embedded in a jelly-like substance of a 

 spherical form, which rolls through the water like the revolv 

 ing globe. The ray-globe volvox is of a yellow color, is pro 

 vided with two organs of motion called cilia; and is likewise 

 furnished with a filament, by which it is connected, either 

 with the centre of the cluster, or with the bottom of its own 

 cell. 



