mnzopoDA. 



23 



(pseudopodia) from various parts of the body, as if it 



were falling apart ; then it retracts these transparent feet 



and becomes perfectly smooth and rounded, resembling a 



drop of slimy, mucous mat- 



ter. The body-mass is di- 



vided into a clear cortical and 



a medullary, granular mass ; 



the outer highly contractile, 



the inner granular portion 



acting virtually as a stock of 



fnnrl Tliocfi 0-rnrmlr.a libo Fi ' 10 -~ Am(ef>a difflwm Ehr. A, the 

 IOOCI. inese giailUieS, IIKC ],.ft-huml figure, the most usual form ; (he 



thp trvflirm nf rhlm-onhvll in risht !ihows tho "road, flat pseudopodia; 

 J 6" opnyil 1 ,he arrows indicate the direction of circula- 



Vegetable Cells and in dia- tionof the granules.-After Clark. 



toms and desmids, circulate in regular, fixed currents, the 

 arrows in the figure indicating the course of the circulating 

 food. The act of circulation is probably assisted by a con- 



tractile vesicle (or 

 vacuole) usually 

 present. There is 

 besides a distinct 

 organ always pres- 

 ent, the nucleus (see 

 Fig. 11), so that the 

 Amoeba earns the 

 right to be called 

 an organism. Its 

 food consists of one- 

 celled ulgte, diatoms, 

 desmids, zoospores, 

 and portions of fila- 

 mentous algae, and it 

 possesses the power 

 of discrimination in 



. 

 tuklllff its lOOQ. 1 lie 



AlIUBDa luiS the pOW- 

 ,, . . 



er oi moving in par- 

 ticular directions, stretching a millimetre in length ; it 

 selects appropriate food, and can engulf or swallow, digest 

 and distribute the tood thus absorbed to various portions of 



Fiff. 11. Anuwa spnarococcm. A, before division. 

 R, the same in it resting stage; a, cyst or cell-wall; 

 d. body-moss; C. nucleus; b. niieleolns. (\ Amoeba 

 nearly divided. I), two young Amoeba;, the result of 

 division. After Haeckel. 



