Many, if not most sciences, present two aspects or departments, closely related to each other but distinct from each other. The first department is that which is called the theoretic or pure science. Its function is to study phenomena, ascertain facts, and establish laws and principles. It has no object in view beyond the acquirement of knowledge. The second department is the practical or applied science. This division has much of the nature of an art, its purpose being to take the facts, principles, and laws worked out by pure science, and devise methods of utilizing them to serve some human purpose. It is telic in Professor Ward's phraseology.

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