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Classification of the Sci
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fore, have separated the Sciences of Gratification into Sciences of Self-Gratification and Sciences of Vicinal[??] Gratification. But, rightly or wrongly, it has been deemed that such a division would not promote the purposes of natural classification. That which moves the man to gratify his neighbor is his own Getting Instinct. Among the gratifications which he might procure for his neighbor, that which it will pay him least to procure is the gratification that he is the most skillful in producing. Thus, industries are founded on different kinds of skill, or, as we have agreed to understand the word, on different Arts. If a man's Art is restricted to procuring a single kind of gratification, it and its science are an Art and a Science of Gratification. But if the man's Art does something or makes something which may be applied to gratifying one instinct or an other, it will be nothing to him, intent on getting, as he is, what gratification it is used for, and in the doing or the