374 THE BOTANISTS OF PHILADELPHIA. 



The work upon which he is at present engaged is a 

 " SynojDsis of the Biddulphoid Forms of the Diatomace?e, 

 with complete Descriptions of Species occurring in North 

 America and a Revision of the Classification." It is nearly 

 completed. 



Professor Boyer is a member of the following societies : 

 American Microscopical Society, Torrey Botanical Club of 

 New York, Academy of Natural Sciences of Philadelphia, 

 Geographical Club. 



CHARLES C. WILLIAMSON. 



Charles C. Williamson was born in Philadelphia, 

 November 1, 1857, and was educated in the private schools 

 of the city. In 1877 he graduated from the University 

 of Pennsylvania as a mechanical engineer. As a boy, he was 

 interested more especially in entomology, until he became 

 absorbed in botany, which was taken up as a side issue. 

 Removing to Harrisburg, during his spare time he col- 

 lected extensively about that place and around Johnstown, 

 Pennsylvania, where, after leaving Harrisburg, he spent 

 four years. Philadelphia then became his place of resi- 

 dence, Mr. • Williamson being engaged as Professor of 

 Drawing in Girard College and in the Spring Garden 

 Institute. He has taken several botanical trips to 

 Florida, two to Wilmington, North Carolina, and to the 

 mountains of North Carolina, where he made extensive col- 

 lections. The living plants collected on the latter trip were 

 presented to the Botanic Garden of the University of Penn- 

 sylvania. His herbarium numbers some 2000 sheets. Mr. 

 Williamson is a life member of the Academy of Natural 

 Sciences and member of the Botanical Section. 



