Forgetfulness.—It has never yet been proved that there is such a thing as forgetfulness: all that we know is that we have no power over recollection. In the meantime we have filled up this gap in our power with the word “forgetfulness,” exactly as if it were another faculty added to our list. But, after all, what is within our power? If that word fills up a gap in our power, might not the other words be found capable of filling up a gap in the knowledge which we possess of our power?