FIG. 4. Learning curves of a female roach 17 mm. long. 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. 



