-JS. 



PREFACE. 



This book is the outcome of much correspondence and 

 research. It is a contribution to the history of botany in 

 America. Until such a history is written, the facts con- 

 cerning our botanists must be recorded in some permanent 

 form. This, the present work, endeavors to do for the 

 region comprised within a radius of sixty miles of the City 

 of Philadelphia. If a circle of such a radius be draw^n on 

 a map, it will include the cities of Lancaster and Easton. 

 Two considerations influenced the author in adopting this 

 limit. (1) It is the one used by the Philadelphia Botanical 

 Club in its herborization trips ; (2) the country within that 

 circle centralizes in Philadelphia. 



Every available source of information has been 

 searched in the endeavor to obtain reliable data. The 

 author feels the shortcomings of the book, and he hopes 

 that the botanical public will overlook the errors consider- 

 ing the fragmentary character of the information available 

 in its preparation. It does not claim to be a complete list 

 of the botanists who lived near Philadelphia; many names 

 which ought to have been included are probably omitted 

 for lack of information concerning them. The author 

 believes that the omissions are few, and that the book gives 

 the names of the greater number of Philadelphia botanists. 



The names are arranged according to the dates of birth 

 in the biographical portion of the book ; according to the 

 letters of the alphabet in the general lists. They are not 



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