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Later, his monomolecular findings contributed to the development of "invisible" glass, and proved helpful in the analysis of certain protein-like compounds.

He finds that in such layers molecules all stand on end, lined up in the same direction; that layers any number of molecules thick could be built up on a pane of glass by repeatedly dipping it in water covered with a monomolecular film.

Last week Dr. Langmuir talked about stearic acid, a substance found in animal fat, which makes a monomolecular film one ten-millionth of an inch thick.