22.5 7.5 15 



Time in light in minutes 



Figure 96. Relation between adaptation to light of different intensities and rate of 

 locomotion in Amoeba proteus. Each point in the figure represents the average for one 

 measurement on each of from fourteen to twenty-three specimens. The time in light 

 is the time from the beginning of movement after exposure until the measurements were 

 made. (After Mast and Stabler, 1937.) 



