impressions with those preceding and following. The more closely knitted together our impressions are, the more closely will they cohere, and the greater will be the facility of remembering or recollecting them. We should endeavor to form our impressions of things so that they will be associated with other impressions, in time and space. Every other thing that is associated in the mind with a given thing, serves as a “loose end” of memory, which if once grasped and followed up will lead us to the thing we desire to recall to mind.
Association by similarity is the linking together of impressions of a similar kind, irrespective of time and place. Carpenter expresses it as follows: “The law of similarity expresses the general fact that any present state of consciousness tends to revive previous states which are similar to it. . . . Rational or philosophical association is when a fact or statement on which the attention is fixed is associated with some fact previously known, to which it has a relation, or with some subject which it is calculated to illus-
