Wallace Hume Carothers (1896-1937) was a chemist and inventor of neoprene artificial rubber and nylon synthetic fiber. He worked as a chemist in E.I. du Pont de Nemours & Company's Fundamental Research Program from 1928 until his death in 1937. John Raven Johnson (1900-1988) was a professor of chemistry at Cornell University from 1930 until his retirement in 1965. He also served as a consultant to E.I. du Pont de Nemours & Company from 1937 until 1951, where he worked for the Organic Chemicals Department. This collection consists of a single short note from Carothers to Johnson thanking him for his recent hospitality.