WAGNER FREE INSTITUTE OF SCIENCE OF 
PHILADELPHIA 
* 
TRUSTEES 
SAMUEL WAGNER, President. 
JOSEPH WILLCOX, Secretary. J. VAUGHAN MERRICK, Treasurer. 
SYDNEY Т. SKIDMORE. HARRISON S. MORRIS. 
SAMUEL T. WAGNER. HENRY LEFFMANN, Chairman. 
FACULTY | 
WILLIAM HEALEY DALL, A.M., Sc.D. ( 
Honorary Professor of Invertebrate Paleontology. 
HENRY LEFFMANN, A.M., M.D., Ph.D. 
Honorary Professor of Chemistry. 
WILLIAM B. SCOTT, A.M; PRD. LLID: 
Honorary Professor of Geology. a 
GEORGE F. STRADLING, Ph.D. 
Honorary Professor of Physics. 
SAMUEL TOBIAS WAGNER, B.S., C.E. 
Professor of Engineering. 
SPENCER TROTTER, M.D! 
Professor of Zoölogy. 
SAMUEL C. SCHMUCKER, Ph.D. 
Professor of Botany. 
LESLIE ВУ SEELY, BA; 
Professor of Physics. 
CHARLES H. LAWALL, Ph.M. 
Professor of Organic Chemistry. 
DAVID W. HORN, Ph.D. n 
Professor of Inorganic and Physical Chemistry. | 
MAYVILLE W. TWITCHEL, Ph.D. 
Geology. 
JOHN G. ROTHERMEL, Director, 
