280 THE BOTANISTS OF PHILADELPHIA. 



for gratification when a bronchial trouble drove him to 

 Florida early in tlie year 1858. Coming homeward by way 

 of Savannah and Aiken, South Carolina, quite a large and 

 varied collection was made. This was supplemented in 

 August by a month's botanizing in the mountains of 

 southwestern Virginia, especially about the cliffs of New 

 River and the Salt Pond Mountain. A two months' visit 

 to Europe next opened some opportunities for exchange 

 and correspondence. 



Up to August, 1860, efforts were mainly confined to 

 ol)taining specimens of the flora of Delaware, eastern Penn- 

 sylvania and the pine barrens of New Jersey. At the date 

 mentioned an extensive journey was made to New York, 

 New England and Canada. The collections made at this 

 time enabled him to exchange extensively with botanists 

 in the three western states of Ohio, Indiana and Illinois, 

 as well as with some in New England and New York. 

 Among these may be mentioned Dr. Vasey, Messrs. Hall 

 and Bebb, of Illinois; Watson, Hope and Lapham, of 

 "Wisconsin; SuUivant, of Ohio, Dr. Sartwell and Judge 

 Clinton, of New York, and several in New England. Pro- 

 fessor Porter and Dr. Traill Green, of Pennsylvania, were 

 also most esteemed correspondents. 



About this time, also, Mr. Canby became acquainted 

 Avith Drs. Gray, Torre}" and Engelmann, and active corre- 

 spondence and most valuable exchanges were the result. 

 The immense stores of foreign botanical treasures which at 

 that time came to Dr. Gray were freely shared with Mr. 

 Canby. He also became a purchaser of all valuable sets of 

 American plants which he could find. The first of these 

 were those of Dr. Parrv and Messrs. Hall and Harbour, 



