Miss Rosa D. Stone at Pan-Amer. bldg. holding a piece of Guayacan wood, 30'' in diameter which weighs 23 oz. while the Balsa wood with 402 sq. inches of surface weighs the same. Balsa is a recent importation from Latin Amer. and is used as substitute for cork. Already popular not only as filler for life-preservers but as stopper for the modern flask [Washington, D.C.]
Harris & Ewing, photographer
Library of Congress
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