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IT may be well, before proceeding to define the scope and present some of the features of this work, to indicate the objects which were entertained in preparing it. It may be said, in general, that two purposes are combined in it, which may be distinguished without attempting to decide which was more important in the execution first, that of doing something for the thinking of the time in the way of definition, statement, and terminology; and second, that of serving the cause of education in the subjects treated.
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