Abow, Henry. ALS; New York, 1899 October 20

Includes correspondence, zoological drawings and papers, and copies of articles. Letters were received by Hay from scientists in the United States, Germany, and France. Some of the correspondence, ca. 1905-06, relates to the Washington Biological Society of which Hay was an officer. Crustacea, especially crayfish, is the predominant subject matter of the papers. Correspondents include A. E. Ortmann, M. J. Rathbun, R. Ridgeway, W. B. Scott, Thomas Stebbing, G. L. Swiggett, and Hay's father Oliver Perry Hay. Some correspondence is also addressed to the elder Hay.