26 



plant decay, the spores pass into the soil. Flagellulae- 

 issue from the spores, and, entering the roots of a healthy 

 plant, become amcebulse. Feeding on the sap, the amce- 

 bulse swell and unite together (plastogamy) to form the 

 plasmodium. 



AM CEBA. 

 (AN EXAMPLE OF THE CLASS LOBOSA.) 



Where is Amoeba found ? Describe its Appearance and 

 general Structure. 



Certain kinds of Amoeba frequent the mud of ponds and 

 ditches, other sorts are found amongst wet Sphagnum 

 moss. A large Amoeba may be visible to the naked eye 



FIG. 3. Ama-ba. (Magnified.) 



On the left is a large diatom which has been engulfed. The largest 

 sphere is the contractile vacuole ; the smaller sphere is tho 

 nucleus. 



as a whitish speck. Irregular in form, like a tiny spot o 

 cloudy jelly, very finely mottled, such is its outward ap- 

 pearance under the microscope. The shape is alWays 

 changing. The protoplasm is in constant streaming motion 



