WAGNER FREE INSTITUTE OF SCIENCE OF 
PHILADELPHIA 
* 
TRUSTEES 
SAMUEL WAGNER, President. 
JOSEPH WILLCOX, Secretary. J. VAUGHAN MERRICK, ‘Treasurer. 
SYDNEY БООКЕ. HARRISON S. MORRIS. 
SAMUEL T. WAGNER. HENRY LEFFMANN. 
FACULTY 
Department of Invertebrate Paleontology, 
WILLIAM HEALY DALL, A.M., Sc.D., 
Honorary Professor of Invertebrate Paleontology. 
Department of Chemistry, 
HENRY LEFFMANN, A.M., M.D., Ph.D., 
Honorary Professor of Chemistry. 
Department о] Engineering, 
SAMUEL TOBIAS WAGNER, B.S., C.E., 
Professor of Engineering. 
Department о] Geology, 
WILLIAMS OS COLD АМ PRD. LL, 
Professor of Geology. 
Department of Physics, 
GEORGE F. STRADLING, Ph.D., 
Professor of Physics. 
Department of Biology, 
SPENCER TROTTER, M.D., 
Professor of Zoölogy. 
SAMUEL C. SCHMUCKER, AM., Ph.D, 
Professor of Botany. 
JOHN G. ROTHERMEL, Superintendent. 
