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, 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., Ph.D., LL.D. 

 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, M.D. 

 Professor of Zoology. 



SAMUEL C. SCHMUCKER, Ph.D. 

 Professor of Botany. 



LESLIE B. SEELY, B.A. 

 Professor of Physics. 



CHARLES H. LA WALL, Ph.M. 

 Professor of Organic Chemistry. 



DAVID W. HORN, Ph.D. 

 Professor of Inorganic and Physical Chemistry. 



MAYVILLE W. TWITCHEL, Ph.D. 

 Geology. 



JOHN G. ROTHERMEL, Director. 



