J^ ^ \J^ WW. ^ 



Vol. 2., 



TRANSACTIONS 



OF THE 



Wagner Free Institute 



OF Science 



OF 



PHILADELPHIA. 



PUBLISHED UNDER THE DIRECTION OF THE FACULTY. 



Decefnber, i88g. 



PHILADELPHIA: 



WAGNER FREE INSTITUTE OF SCIENCE, 



MONTGOMERY AVE. AND 17TH ST. 



