2I 4 



ELEMENTS OF SCIENCE 



have already of spoken the Amoeba,* which protrudes 

 short blunt processes, and so changes its shape in the 

 most protean fashion. All these creatures feed by simply 

 taking in their food at any point of the surface of their 

 bodies and similarly discharging what they cannot 

 digest. There are also the Flagellata, which swim about 

 FIG. 40. 



A RADIOLARIAN (AuloSCCHa miYObills] GREATLY MAGNIFIED. 



by the aid of one or more vibratile cilia, as does the 

 plant Protococcus before described. t Then comes the 

 great group of Infusoria, which are slightly more 

 complex in structure and bear bands of vibratile cilia. 



Sponges come next, which, very simply organised 

 multicellular organisms, have their cells arranged in 



* See ante, pp. 197 and 198. 



t See ante, p. 200. 



