The only way a man can put a stop to such pleasant but uneducative roamings, is to snap off his train of day dreaming the first moment he becomes aware of it, and to address his mind to some useful serious subject. His thoughts will be almost sure to leak away again. They may do this as often as fifteen times in half an hour. But the second he becomes aware of it he should dam up the stream and send his thoughts along the channel he has laid out for them. If he has never done this he will find the effort great. But if he merely resolves now that the next time his mind wanders he will stop it in this manner, his resolve will tend to make itself felt. If he succeeds in following this practice once it will be much easier a second time. Every time he does this it will become increasingly easy, until he will have arrived at the point where his control over his thoughts will be almost absolute. Not only will it be increasingly easy for him to turn his mind to serious subjects. It will become constantly more pleasurable. Frivolous and petty trains of thought will become more and more intolerable. This whole idea of forcing our thought has been questioned by no less a thinker than Herbert Spencer. Let us hear what he has to say regarding his own practice: “It has never been my way to set before myself a problem and puzzle out an answer. The conclusions at which I have from time to time arrived, have not been arrived at as solutions of questions raised; but have been arrived at unawares—each as the ultimate outcome of a body of thoughts which slowly grew from a germ. Some direct observation, or some fact met with in reading, would dwell with me: apparently because I had a sense of its significance. It was not that there arose a distinct consciousness of its general meaning; but rather that there was a kind of instinctive interest in those facts which have general meanings. For example, the detailed structure of this or that species of mammal, though I might willingly read about it, would leave little impression; but when I met with the statement that, almost without exception, mammals, even as unlike as the whale and the giraffe, have seven cervical vertebræ, this would strike me and be remembered as suggestive. Apt as I thus was to lay hold of cardinal truths, it would happen occasionally that one, most likely brought to mind by an illustration, and gaining from the illustration fresh distinctiveness, would be contemplated by me for a while, and its bearings observed. A week afterwards, possibly, the matter would be remembered; and with further thought about it, might occur a recognition of some wider application than I had before perceived: new instances being aggregated with those already noted. Again after an interval, perhaps of a month, perhaps of half a year, something would remind me of that which I had before remarked; and mentally running over the facts might be followed by some further extension of the idea. When accumulation of