BEHAVIOR OF THE COMMON ROACH. 



351 



I'nder the first head there are three subdivisions: (i) rushes into 

 the water without attempting to run the maze, (2) falls into the 

 water after the roarh had begun to run the maze, and ($) jumps 

 into the water. Under the second head there are two subdivi- 

 sions: (i) entering blind alleys, and (2) moving in the wrong 



FIG. 3. Learning curves constructed from the average reactions of ten roaches. 

 The spaces from right to left represent successive trials. A, the number of times 

 the roach rushed into the water before beginning to run the maze. B, the number 

 of times the roach fell into the water after beginning to run the maze. C, the 

 number of times the roach jumped into the water. D, the total number of times 

 the roach entered blind alleys. E, total number of errors made. F, total minutes 

 required to run the maze. 



