DIRECTION OF LOCOMOTION 



279 



1O:58 



11:02 



13:10 



:2O 



13:OO 



:4O 



:56 



\ 



:52 



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

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

 nified 1() dianis. 



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) XXIII.) 



