4] 



DIRECTION OF LOCOMOTION 



279 



10:58 



11:02 



:20 



:56 



:52 



FIG. 72. Camera drawing, showing the successive positions assumed by Amosba 

 proteus when acted upon by external agents uniformly in all directions. Mag- 

 nified 16 diams. 



FIG. 73. Tracks made on paper by larvae' of Musca caesar moving in the dark from 

 a central spot of colored fluid. (From POUCHET, '72. Revue et Mag. de Zool. 

 (2) XXIH.) 



