1 8 On the Boundaries of Empires. 



Protoxide of iron, in octohedral crystals. 



Chromate of iron, forming a superficial blue covering 



on some specimens of serpentine. 

 Carbonate of magnesia, pulverulent, in crusts and stel- 

 lated crystals, sometimes colored by iron. 

 Carbonate of lime, in veins. 

 Cereolite. 

 Zeolite. 

 Steatite. 

 Chlorite slate. 



In serpentine, one mile from Mr. Taylor's house. 

 Jasper, yellow, brown and red. 

 Quartz crystals. 

 Asbestos, in serpentine. 



Do. ligniform. 

 Talc. 

 Carbonate of magnesia. 



In primitive limestone, at Mr. Cope's quarry. 

 Titanium, red oxide. 

 Brown mica. 

 Cyanite. 



Magnesian limestone, decomposing, forming sand. 

 Coarse granular do. 

 Necronite or fetid feldspar. 

 Tremolite, glassy, fibrous. 



Near the Friends' meeting house. 

 Sphene, augite and feldspar. 

 The minerals from these various localities may be seen in 

 the Museum of the Chester county Cabinet of Natural His- 

 tory, which has been founded by the unremitted exertions of 

 Dr. William Darlington and his friends. 

 Philadelphia, Dec. 1, 1827. 



'*»■■. , , , • 



Art. III. — On the Effect of the Physical Geography of the 

 world, on the Boundaries of Empires j by John Finch, 

 F. B. S. &c. 



The limits of empires are controlled by two causes, the 

 physical geography of the soil, and the power of man ; the 

 first is eternal, the last variable ; thus, in examining history, 

 we find that the first produces the most permanent effect. 



Nations often war against those eternal limits, which are 

 pointed out by nature. 



