THE BOTANISTS OF PHILADELPHIA. 411 



Pennington, Dr. Mary Engle. A careful chemico-physi- 

 ological worker, late Fellow in Botany, University 

 of Pennsylvania, and author of a valuable paper in 

 the Botanical Contributions of the University of Penn- 

 sylvania, 1 : 203, entitled, " A Chemico-Physiological 

 Study of Spirogyra nitida." 



Pennock, Edward. Dealer in botanical and medical sup- 

 plies, Philadelphia. 



Peters, Rev. John E. A botanist and collector of con- 

 siderable insight, located as pastor successively at 

 May's Landing, Pleasantville and Camden, N. J. 



Porter, Dr. Hobart C. Graduate of Princeton in 1881 ; 

 received the degree of B. L. from the University of 

 Pennsylvania in 1884, and Ph. D. from the Univer- 

 sity of Rostock, Germany in 1894; Instructor in 

 Botany, University of Pennsylvania, and translator 

 of " A Text-Book of Botany," by Strasburger, Noll, 

 Schenck, and Schimper, 1898. Dr. Porter has special- 

 ized on the algae and the vascular cryptogams, hav- 

 ing, as Lecturer in the Department of Philosophy 

 and Department for Teachers, given extended labora- 

 tory courses on the same. 



Potts, Charles. 



Price, Ferris W. Swarthmore College, Pa. 



PuGH, Evan.* Mentioned as a collector of plants in the 

 " Flora Cestrica." 



Putnam, Miss Bessie L. Harmonsburg, Pa. 



Pyle, Miss Gheretien G. Wilmington, Del. 



Rand, Theodore. 



Rau, Eugene A., of Bethlehem, Pa. A student of mosses 

 and fungi. 



