238 THE BOTANISTS OF PHILADELPHIA. 



of Ijotany. One of the founders and the first President of 

 the Linn^ean Society of Lancaster County, for thirteen 

 years he explored its territory, going over the ground where 

 Muhlenberg had ranged before him, and, in 1869, pub- 

 lished a catalogue of its flora. On coming to Easton, in 

 1866, he organized a natural history society in the College, 

 for local work, which continued in active operation up to the 

 burning of Pardee Hall in 1877, and during this time large 

 collections were made of rocks, animals and plants, and a 

 considerable library formed. His own herbarium, already 

 extensive, became the property of the College, and, since 

 then, has been greatly enlarged by his untiring labors, 

 until it ranks among the first in the land. It contains 

 specimens from all parts of the world, but is especially 

 rich in plants of the United States, both east and 

 west of the Mississippi, and well represents the growth of 

 our knowledge in this field for the last half a century. It 

 comprises a flora of the State of Pennsylvania, which is, by 

 far, the fullest and best in existence. This most valuable 

 herbarium was, with the exception of the fine one of Penn- 

 sylvania plants, consumed by fire on December 18, 1897, 

 which occurred by the act of an incendiary in Pardee Hall, 

 where the collections were stored. The mineralogical col- 

 lection and many valuable books and apparatus were also 

 destroyed. The collections made by Dr. Hayden in the 

 Pocky Mountains from the year 1870 to 1874 passed 

 through his hands, and his reports upon them are to be 

 found in the publications of the survey hx the government. 

 Of these, the most important, " A Synopsis of the Flora of 

 Colorado," prepared conjointly with President Coulter, of 

 Wabash College, was issued in a separate volume in 1874. 



