J. Lippincott Company, 1924. First Edition. 8vo, 27 pages, illustrated; VG-; grey cover with black print, pencil notation upper left corner, peripheral tanning, slight tear at upper right corner; back cover has blue library stamp at bottom edge, slight tear at left edge, slight spotting; interior clean but for slight tear at right edge of p. 11; "Reprinted from the Journal of the Franklin Institute, July, 1924."
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