_Conditions of the Growth of Association, or of the Retentiveness of the Mind_.--A practical, as well as a theoretical, interest attaches to the precise statement of the conditions or circumstances that regulate the growth of our associations, in other words our mental culture generally. All agree in the efficacy of the two conditions mentioned in the text; the vividness of the feelings associated, and the frequency of the association, that is repetition or practice. It is well remarked, however, that the phrase "vividness of the sensations or ideas" does not convey a very precise meaning. The proper attribute of a sensation, or an idea, considered as an _intellectual_ element, is greater or less distinctness; when an object seen or remembered is seen or remembered distinctly and fully, and without any unusual labour or effort, there is nothing more to be desired, so far as concerns our intelligence. If, however, the object is accompanied with _feeling_--with pleasure or pain--a new element is introduced, to which other epithets are applicable. A feeling is more or less strong or intense; and the addition of an intense feeling to an intellectual conception is a sum, combining both sets of attributes--distinctness and adequacy in the conception, and intensity in the feeling. An object whose perception or conception is thus accompanied with the animation of strong feeling, is called lively, or vivid; {117} in the absence of feeling, these epithets are unsuitable. Hence, the associating stimulus expressed by "vividness" is better expressed by the "strength of the feelings." Any strong feeling impresses on the mind whatever is the object of it, or is in any way mixed up with it. We remember by preference the things that have given us either pleasure or pain; and the effect may be produced by mere excitement although neither pleasurable nor painful; the influence of a surprise being a case in point. Our _interest_ in a thing is but another name for the pleasure that it gives us; and to inspire interest is to aid the memory. Hamilton's Law of Preference refers to this source; and appears to exclude, or not to recognise, the efficacy of feelings not pleasurable, namely, such as are either painful or neutral. The comprehensive law should include all the feelings, although there are specific characters attaching to the influence of each of the three modes. Pleasure is the most effectual in stamping the memory, as it is the most powerful in detaining the attention and the thoughts. Pain has a conflicting operation; as affecting the will, it repels the object; but as mere excitement it retains it; we cannot forget what is disagreeable, merely because we wish to forget it. The stimulant of pain, as applied in education, is an indirect pleasure. It is not intended to make the subject of the lesson disagreeable, but to render painful all diversions from that towards other subjects; so that comparatively the most pleasing course to a