The operators hand was therefore drawn slowly away from him, and he was thus led gradually through the maze.

After this, he behaved quite normally and his learning curves are comparable with those of the other rats.

The fourth case was similar to this, only that on four successive occasions the rat did not find the food in half-an-hour.

On the fifth occasion he was led through by hand with the same result as with the previous rat.

The twenty-two rats, whose records form the bulk of the following results, showed no disturbance at being put into the maze, and after a very few experiments they strained to get into it when they were brought near.