380 THE BOTANISTS OF PHILADELPHIA. 



College. Between 1885 and 1894 he occnpied the chair of 

 geology and botany in the same institution. During this 

 time he was mycologist for the Delaware College Agricul- 

 tural Experiment Station, in connection with which insti- 

 tion he has done most of his botanical work. In 1887 he 

 was elected a Fellow of the American Association for the 

 Advancement of Science ; in 1889, a Fellow of the American 

 Geological Society, and 1892, a member of the Society for 

 the Promotion of Agricultural Science.* 



IDA A. KELLER. 



Dr. Ida A. Keller was graduated from the Girls' High 

 School of Philadelphia in 1883. From 1884 to 1886 she 

 was a student in the Department of Biology in the Univer- 

 sity of Pennsylvania, and the year following was assistant 

 in the herbarium at Bryn j\Iawr College. 



From 1887 to 1889 Dr. Keller was a student at the 

 University of Leipzig with Professor Wilhelm Pfeffer, the 

 leading plant physiologist of the day, and with Professor 

 Friedrich Stohmann in chemistry. In 1889 and 1890, she 

 was a student at the University of Zurich, where she received 

 the degree of Doctor of Philosophy. 



The two years following. Dr. Keller was Lecturer in 

 Botany at Bryn Mawr College, and from 1893 to the present 

 has been Teacher of Chemistry and Director of the Natural 

 History Department at the Girls' High School. 



She is a member of the Academy of Natural Sciences, 

 of the Philadelphia Botanical Club, and has undertaken, 

 under the auspices of the clul), the compilation of a " Flora 

 of Philadelphia and Vicinity." 



* For Geological papers see Am. Jour. Sci.; Proceedings of A. A. A. 8.; Phila. 

 Acad. Nat. Sci.; Second Qeol. Survey of Penna. and U. S. Geol. Survey. For 

 botanical papers see Reports of Del. College Agr. Expt. Sta. 



