130 



PHYSIOLOGY 



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CW 



A B 



Fig. 72.— Paramecium. A, from the left side, anterior end directed upwards ; B. 

 from the ventral side, anterior end directed upwards ; on, anal spot ; c.v., con- 

 tractile vacuoles', f.v., food-vacuoles ; w. v., water vacuoles; m, mouth; mac, 

 miCy nucleus ; ce, oesophagus;?;, vestibule. The arrows inside indicate the direc- 

 tion of the protoplasmic currents, those outside the direction of water currents 

 caused by the cilia. (Prom Sedgwick and Wilson.) 



digested. The nutritive portion is thus brought to every 

 part of the body where it may be used for the manu- 

 facture of new protoplasm, and the indigestible refuse 

 to a weak spot in the body wall through which it is 

 ejected. 



