Special Points: 1st Edition, 1920. Scarce. First English language book published on his theory. Signed by Charles Robinson Smith, founder of the General Chemical Company of New York, Influential New Yorker with historic house at 34 W. 69th Street, New York City.
Overall Condition: Very good. Light pencil markings on text likely by Smith on several pages (could probably be erased). Binding tight. Paper covered hard boards with cloth spine. No Jacket issued.