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WAGNER FREE INSTITUTE OF SCIENCE OF 
PHILADELPHIA 
{ 
TRUSTEES 
SAMUEL WAGNER, President. 
JOSEPH WILLCOX, Secretary. J. VAUGHAN MERRICK, Treasurer. 
SYDNEY T. SKIDMORE. HARRISON S. MORRIS. 
SAMUEL T. WAGNER. HENRY LEFFMANN. 
FACULTY 
WILLIAM HEALEY DALL, A. M., Sc.D. 
Honorary Professor of Invertebrate Paleontology. 
HENRY LEERMANN, AM. M. Di, РВ. D 
Honorary Professor of Chemistry. 
WILLIAN SCOTI A-Ma Ph Dy LED, i 
Honorary Professor of Geology. 
GEORGE F. STRADLING, Ph.D. 
Honorary Professor of Physics. 
SAMUEL TOBIAS WAGNER, B.S., C.E. 
Professor of Engineering. 
SPENCER TROTTER, МЕШ 
Professor of Zoólogy. 
SAMUBLICHSCHMUCOKER, PAD: 
Professor of Botany. 
LESLIE ВИЗЕУ B.A. 
Professor of Physics. 
CHARLES P LAWALL, Ph, M; 
Professor of Organic Chemistry. h 
DAVID W. HORN, Ph.D. 
Professor of Physical and Inorganic Chemistry. 
BENJAMIN L. MILLER, A.B., Ph.D. 
Geology. 
JOHN G. ROTHERMEL, Superintendent, 
