Introduction 



Earle, Miss Elizabeth C, Dept. of Botany, Univ. of Pa., Phila- 

 delphia, Pa. 



Fernald, Prof. Merritt L., 1873-, Gray Herbarium, Cambridge, 

 Mass. 



Fogg, Prof. John M., Jr., 1898-, Univ. of Pa., Philadelphia, Pa. 



Fosberg, Dr. F. Raymond, 1908-, Bur. Plant Ind., Washington, 

 D. C. 



Houghton, Prof. Clinton 0., 1873-, Univ. of Del., Newark, Del. 



Houghton, F. Courtland, Univ. of Del., Newark, Del. 



Jones, Dr. Frank Morton, 1869-, Wilmington, Del. 



Larsen, Esther L. (Mrs. Kenneth D. Doak), R. D. 4, Crown 

 Point, Ind. 



Leeds, Arthur N., 1870-1939 



Long, Bayard, 1885-, Acad. Nat. Sci., Philadelphia, Pa. 



MacElwee, Alexander, 1869-1923 



McVaugh, Dr. Rogers, 1909-, U. S. Dept. of Agric, Beltsville, 

 Md. 



Meredith, Hugh B., 1853-1929 



Moldenke, Harold N., 1909-, N. Y. Bot. Card., New York, N. Y. 



Moyer, Dr. Isaac S., 1838-1898 



Nuttall, Thomas, 1786-1859 



Otis, Rev. John P., 1846-1934 



Pennell, Dr. Francis W., 1886-, Acad. Nat. Sci., Philadelphia, 

 Pa. 



Proctor, George R., 1920-, Dept. of Botany, Univ. of Pa., 

 Philadelphia, Pa. 



Shreve, Dr. Forrest, 1878-, Carnegie Inst., Tucson, Ariz. 



Small, Dr. John K., 1869-1938 



Smith, Dr. Augustus V., 1902-, Central High School, Washing- 

 ton, D. C. 



Stone, Hugh E., 1871-, Haverford, Pa. 



Stone, Witmer, 1866-1939 



Tanger, Mrs. L. F. A., Lancaster, Pa. 



Tatnall, Edward, 1818-1898 



Tatnall, Dr. Robert R., 1870-, Wilmington, Del. 



Tidestrom, Ivar, 1865-, Catholic Univ. of Amer., Washington, 

 D. C. 



True, Prof. Rodney H., 1866-1940 



Vanatta, Edward G., 1876-1939 



Van Pelt, Samuel S., 1863-1935 



XXV 



