THE 



AMERICAN 



JOURNAL OF SCIENCE, &c. 



Art. I. — On the Mineralogy of Chester County, with an 

 account of some of the Minerals of Delaware, Maryland, 

 and other localities $ by George W. Carpenter, of Phi- 

 ladelphia. 



Assisted by my friend Mr. George Spackman of Phila- 

 delphia, I published in the 9th Vol. of this Journal, an ac- 

 count of the various minerals, which we found on a tour 

 made in 1825, through Chester county and part of the state 

 of Delaware. On a late revisit to these localities, and a 

 further extent of investigation, I discovered many additional 

 localities of interesting minerals, which with the previous 

 catalogue already described, will embrace most of the min- 

 erals contained in the severals townships which have yet 

 been explored. 



Chester county presents to the mineralogists a rich field 

 for investigation. Her limestone, serpentine and gneiss, the 

 predominant rocks of the county, contain inexhaustible 

 beds of interesting minerals, and the numerous quarries every 

 where in operation, greatly facilitate the means of procuring 

 them. These circumstances, with the polite attention mani- 

 fested towards strangers by the inhabitants of the county, 

 and the singular hospitality which particularly characterizes 

 them, are inducements of the strongest nature for encour- 

 aging the mineralogist, to visit this county in preference to 

 almost any section of country. 



It is a gratifying circumstance for the lovers of natural 

 history, to learn that mineralogy, its most interesting, use- 

 ful and important department, is making rapid advancement 

 in this county, and in the state of Delaware. Almost all 

 classes of society are taking an interest in its promotion, par- 

 ticularly the farmers, and if the same zeal and ardor for 



Vol. XIV.— No. J. 1 



