First Edition. 8vo, 14 pages, illustrated; VG; brown cover with black print, pencil notation to upper left corner; back cover has blue library stamp at lower edge, fold to upper left corner and last page; interior clean but for slight spotting; "Reprinted from 'The Scientific Journal of the Royal College of Science.' Volume XX"; "A Lecture delivered before the Society on Thursday, 8th of December, 1949."
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