Cellular Plants. 247 



forming subdivisions. These subdivisions become rounded or ovoid 

 bodies about ^^_ of an inch in diameter, the whole mass aggregating 

 about -* of an inch in diameter. Each of these subdivisions bounded 



3OO 



FIG. 106. 



Showing gradual enlargement of the Corpuscles 

 of an Infusion and conversion of one into an Am- 

 oebaMagnified 800 times. ( After Bastian. ) 



FIG. 106. 



by a slightly condensed pellicle of its own, contains in its body of jelly 

 from four to eight of the granules of altered Bacteria. It often happens 

 that this development goes no further, but breaks up and is resolved 

 back to motionless Bacteria. 



FIG. 107. 



a. Group of Vorticellse. 

 6. Single Vorticella more 

 highly magnified. 

 c. Kolpoda, 

 d. Parameeium. 

 e-Enchelys. 



(After Bastian.) 



FIG. 107. Ciliated Infusoria. 



But at other times it goes forward and each of the subdivisions or 

 corpuscles becomes an active Amoeba and in some cases it may become 

 a flagellated or tailed Monad. These Monads are formed with surprising 

 rapidit} r , developing at times a tail or whip at each end. After Amoebae 

 are formed they frequently fuse together, several smaller ones becoming 

 a large one. 



The infusorium called the Enchelys by its discoverer Dujardin, is an 

 intermediate organism between the flagellated Monad and the ciliated 

 infusoria Parameeium and Kolpoda. These last two are much alike and 

 do not differ in any essential particular. There can be little doubt that 

 these infusoria will develop from the organic matter contained in a cold 

 infusior of hay. A temperature of only 120 F. seems to destroy the 

 organism of the protoplasm. Like the other simple organisms named 

 above, they take their rise in the " pellicle" or scum on top of the in- 

 fusion, and their development is somewhat as follows: This pellicle is 

 formed, as before stated, of organic matter in granular form, made up 

 of Bacteria or their aggregated remains. Some of these granules be- 

 come concentrated into a small, roundish mass, surrounding which is 

 formed a clear, transparent cover which calls to mind the ' ' zona pellu- 

 cida " of the higher animals. Inside of this, which soon becomes a well 

 defined membrane, the granular matter, after being first dispersed 

 throughout the fluid matter contained in the cell, is formed into an em- 



