Criticism of Humphrey. As previously stated I am in full accord with Humphrey in his attempt at explaining learning, or memory, without the introduction of a special faculty. But his solution, as presented in the preceding quotations, seems to me at least incomplete. I am not certain whether I understand Humphrey correctly; therefore the following critical remarks, although aimed at him, may not strike him; even so they would not be entirely lost inasmuch as they deal with a position which it is tempting to take.