Whether habits shall master us, or whether we shall be their masters, depends also on the method by which they were acquired. If they were learned merely through mechanical drill, they will be fixed and rigid. If they were learned deliberately to meet new situations, they will not be retained when the conditions they were acquired to meet are utterly changed.
THE SPECIFICITY OF HABITS. One important consideration, finally, that must be brought to consideration is that habits are, like instincts, specific. They are not general "open sesames" which, learned in one situation, will apply with indiscriminate miraculousness to a variety of others. Just as an instinct is a definite response to a definite stimulus, so is a habit. The chief and almost only observable difference is that the former is unlearned, while the latter is learned or acquired.
But while habits are specific, they are within limits transferable. Such is the case when a situation which calls out a certain habitual response is paralleled in significant points by another. Thus the situation, one's-room-at-home-cluttered-up-with-a-miscellany-of-books-papers-tennis-apparatus-and-clothing, has sufficiently similar significant points to the situation, one's-office-littered-with-documents-old-letters-manuscripts-blueprints-and-proofs, to call forth, if the habit has been established in one case, the identical response of "tidying up" in the other. But unless there are marked points of similarity between two different sets of circumstances, specific habits remain specific and non-transferable. There is in the laws of habit no guarantee that an industrious application to the batting averages of the major league on the part of an alert twelve-year-old will provoke the same assiduous assimilation of the facts of the American Revolution; that a boy who works hard at his chemistry will work equally hard at his English, or that one who is careful about his manners and pronunciation in school will display the slightest heed to them among his companions on the ball-field. One of the most cogent arguments against the stereotyped teaching of Latin and Greek has been the serious doubt psychologists have held as to whether four years' training in Latin syntax will develop in the student general mental habits which will be applicable or useful outside the Latin classroom.