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Rh "Standard (or Riverside) Natural History." He has contributed many addresses and reviews to the "Nation," "Science" and other magazines; and also many articles to the proceedings of various scientific associations. He was associate editor of Johnson's New Universal cyclopedia; of the Century dictionary; and of the Standard dictionary. From 1879 to 1886 he prepared the reports on zoölogy for the Smithsonian Institution.

He is a member of the Archæological society, of the Biological society and of the Entomological society, of Washington, District of Columbia. He is also a member of the Cosmos club of Washington.