have children understand the use to which the given response is to be put, or, if this is not possible, to introduce some extraneous motive which will give satisfaction. We cannot be too careful in the habits which we seek to have children form to see to it that the first response is correct. It is well on many occasions, if we have any doubt as to the knowledge of children, to anticipate the response which they should give, and to make them acquainted with it, rather than to allow them to engage in random guessing. The boy who in writing his composition wishes to use a word which he does not know how to spell, should feel entirely free to ask the teacher for the correct spelling, unless there is a dictionary at hand which he knows how to use. It is very much better for a boy to ask for a particular form in a foreign language, or to refer to his grammar, than it is for him to use in his oral or written composition a form concerning which he is not certain. A mistake made in a formula in algebra, or in physics, may persist, even after many repetitions might seem to have rendered the correct form entirely automatic. In matters of habit it does not pay to take it for granted that all have mastered the particular forms which have supposedly been taught, and it never pays to attempt to present too much at any one time. More satisfactory work in habit formation would commonly be done were we to _teach_ fewer words in any one spelling lesson, or attempt to fix fewer combinations in any particular drill lesson in arithmetic, or assign a part of a declension or conjugation in a foreign language, or to be absolutely certain that one or two formulas were fixed in algebra or in chemistry, rather than in attempting to master several on the same day. Teachers ought constantly to ask themselves whether every member of the class is absolutely sure and absolutely accurate in his response before attempting new work. It is of the utmost importance that particular difficulties be analyzed, and that attention be fixed upon that which is new, or that which presents some unusual difficulty.