The great advantages derived by them from these exercises, in developing and strengthening the mental powers, in fixing the attention, and in awakening a strong desire to acquire knowledge understandingly, by seeking the why and wherefore at every step in their progress, wrought in the author a firm conviction that algebra, in this shape, should precede written arithmetic; and that such would be the case at no distant period. A bout three years ago, the design of the author to publish a mental algebra, was communicated to two of the most distinguished teachers in this city, and met with their approval; but unceasing duties in managing a large institution, have hitherto delayed its publication.
(Typographical errors above are due to OCR software and don't occur in the book.)
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