This Philadelphia naturalist became interested in insects and plants in early childhood; being of German extraction, his parents supplied him with entomological books in their mother tongue. This language proficiency aided him in the translation of scientific papers and later accounted for his position on the staff of Biological Abstracts. Interested in many societies, he held office in the Academy's Entomological Section, the American Entomological Society, the Feldman Collecting Social, and assumed duties of maintaining the interest of boys in the Germantown Entomological Club from 1926-1930. This collection of papers is concerned with his articles on Lepidoptera, some of which were published, catalogs of the Academy's insect specimens, a review and a translation. His 40,000 Lepidoptera collected in the environs of Philadelphia and the New Jersey pine barrens were presented in the Academy before his death.