THE PROTEUS ANIMALCULE. 



159 



SfMiiflPP 



^^^^^v^^^^ 



Fio. 84. ^.nuBba Proteus, from life X 300. The arrows indicate the direction of the 

 protoplasmic currents ; n, nucleus ; e.r, contractile vacuole ; /.r, food-vacuole ; 

 w.v, water-vacuole. A. shows the texture of the protoplasm. B is an outline of 

 the same individual four minutes later ; the upward currents at the right of Fig. 

 A have stopped, reversed, and the main flow is now towards the left. 



