Intellectual Algebra or Oral Exercises in Algebra for Common Schools

From the cover "All the operations are limited to such small numbers as not to embarrass the reasoning powers, but, on the inductive plan, to lead the pupil understandingly, step by step, to higher mental efforts".  First published in 1847 by David B. Tower "Late principal of the Eliot Grammar School, Boston, and of the Penn Institute for the Instruction of the Blind; author of The Gradual Reader, or Exercises in Articulation".  Sixth edition.  Paperback, 46 pages.