PROTOPLASM MOVEMENTS. 7 



(Fig. 5). The streams are made clearly visible by the motion 

 of the granules which are carried along by the moving hya- 

 line portion of the protoplasm. After running in one 



Fig. 5. A small mass of the naked protoplasm (plasmodium) of Didymlum aer 

 pulu ; the arrows show the direction of the currents, x 80. After Hofmeister. 



direction for some minutes (about five) the current stops, 

 ,nd then it usually sets in an exactly opposite direction for 

 about the same length of time, and carries back the previ- 

 ously moved protoplasm. 



