10 INTRODUCTION. 



journey I undertook to visit the sources of the 

 river Delaware, and Susquehannah, exploring 

 first the Pine barrens and Sea shores of New 

 Jersey, next going from Albany over the Hei- 

 delberg mountains to the Lake Utsiantha 

 source of the Delaware at the foot of the Kis- 

 kanom mountains, and Lake Otsego source of 

 the Susquehannah. 



The year 1834 saw me twice in the Alle- 

 ghany mountains of the north, once by follow- 

 ing the course of the Delaware, the second 

 time westward by the Welsh mountains, Cone- 

 wago mountains, Albany mountains. Locust 

 mountains to the Pottsville mines and the 

 source of the Schuylkill river, returning by 

 Mauchchunk and Allentown. 



My travels of 1835 were in the Central Al- 

 leghanies up the River Juniata and Susque- 

 hannah, exploring the mountains of Peters, 

 Buffalo, Wiconisco, Mahantango, Tuscarora, 

 Jack, Seven mountains, &c. with their Val- 

 leys. An account of all these travels and ex- 

 cursions is given by me more at length in my 

 liife of travels and researcJies^ published ear- 

 ly in 1836. Since then I have chiefly explor- 

 ed South New Jersey and the pine barrens. 



Although these journeys were often under- 

 taken with the additional ulterior view to col- 

 lect Fossils and Animals, my favorite science 

 and pursuit of Botany was always my main ob- 

 ject. I always travelled with my botanical col- 

 lecting book and reams of paper to preserve my 

 plants : and thus I have been enabled to collect 

 in 20 years, since 1816, a most valuable Her- 

 barium, rich in new species, rare plants, and 

 complete Monographs; which have been in- 

 creased by exchanges and purchases, chiefly of 



