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GENEALOGICAL TREE OF ANIMALS 



Showing in order of evolution the general relations of the chief 



classes into which the world of living things is divided. This 



scheme represents the present stage of our knowledge, but is 



admittedly provisional. 



DIAGRAM OF AMOvBA 



(Greatly magnified.) 



The amoeba is one of the simplest of all aminals, and gives us a 

 hint of the original ancestors. It looks like a tiny irregular speck 

 of greyish jelly, about i/iooth of an inch in diameter. It is com- 

 monly found gliding on the mud or weeds in ponds, where it en- 

 gulfs its microscopic food by means of outflowing lobes (PS) . The 

 food vacuole (FV) contains ingested food. From the contractile 

 vacuole (CV) the waste matter is discharged. N is the nucleus, 

 GR. granules. 



