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the beach, or the agreement of sounds and signs in unrelated languages, have no interest and subserve none of the purposes of knowledge. A resemblance which is a mere resemblance, which casts no light on the past, and gives no clue to the future, which discloses none of the forces at work in the world, is unfruitful, and the knowledge of it of no value. That which makes the search after agreements so unremitting are the axioms of causation: that Like causes are followed by like effects, and that Like effects indicate like causes. These transform a knowledge of real central agreements into power, put us in connection with the plan of the world, enable us to bring new forces into it, and take new and coveted effects from it. Resemblance is simply the key to the storehouses of forces.

Uncultivated minds, so far as they pursue knowledge at all, do it under this form; an observation of resemblances with reference to an ulterior possession and control of causes. The savage distinguishes between the different kinds of timber, because he expects the same external indications to remain the accompaniments and marks of certain interior qualities of strength, weight, elasticity. A bow of the same material he believes will exhibit the same good points with which he is familiar; a spear of like wood possess like pliancy and toughness. Language comes in to mark and hold together for the mind-these agreeing things, by which the implements of man, and his successive wants are to be supplied.

Science, the advanced and complete movement of thought, is but a more rigid separation of like with like, a more careful selection of central qualities, a complete and interdependent classification of objects, both that the resources of the globe, in all its ministration to human life, may be laid open, and also, that the concealed chart of laws, according to which the events of the present come pouring