to the fact that the various facts are associated in our minds only by contiguity in time or place, or both, the associations of relation being lacking. In other words we have not properly classified and indexed our bits of information, and do not know where to begin to search for them. It is like the confusion of the business man who kept all of his papers in a barrel, without index, or order. He knew that “they are all there,” but he had hard work to find any one of them when it was required. Or, we are like the compositor whose type has become “pied,” and then thrown into a big box—when he attempts to set up a book page, he will find it very difficult, if not impossible—whereas, if each letter were in its proper “box,” he would set up the page in a short time.
This matter of association by relation is one of the most important things in the whole subject of thought, and the degree of correct and efficient thinking depends materially upon it. It does not suffice us to merely “know” a thing—we must know where to find it when we want it. As old Judge Sharswood, of Pennsylvania, once said: “It
