just done. In the 35th, the 48th and the 55th tests she opened

the door in much the same manner as both had done previ- ously. According to my notes the correspondence between the behavior of these two birds is close, but there is little proof that one changes its behavior because of the example set by the other. Fig. 15.

At about the 4yth test the male Bluebird began regularly to open the door. The table is not carried farther than the 64 th test for the reason that "nothing except a lowering of the time and number of efforts occurs. There is little necessity then for a tabular statement of the remainder of the 141 tests. It should be added that the number of efforts by the male Blue- bird is often greater than would be expected. An explanation for this may be found when we see what occurred in the Mem- ory series which were made after one month had elapsed.

For these tests the Bluebirds were alone and in a smaller cage. They were placed here sometime prior to the beginning of this series. From any of the results, or an average of the entire number, it may be seen that they have by no means lost all the training due to their earlier experiences with this box. Their average time is perhaps three or four times what it was at the close of the initial series. Barring disturbing fac- tors in both the initial and first part of the memory series the number of efforts required is about the same. It is probable