Wallace Hume Carothers (1896-1937) was 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. These items consist of four photographs preserved by Wilko Gustad Machetanz (1895-1973), Carothers's Tarkio College roommate and lifelong friend.