Excerpt from Replies by Prof. Lawrence S. Benson, Author of Benson's Geometry, to Prof. E. T. Quimby, Dartmouth College, Hanover, N. H., Prof. Wm. Chauvenet, LL. D., Washington University, St. Louis, Mo., Prof. Robert D. Allen, and Prof. A. T. Bledsoe, LL. DIn giving the direct demonstrations in all cases, I had to consider the Reductio ad Absurdum of euclid, whereby he endeavored to sustain the proposition that the area of the circle is the r...
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