AMERICAN EDITION 



OF THE 



BRITISH ENCYCLOPEDIA. 



OR 



DICTIONARY 



I 



OF 



ARTS AND SCIENCES. 



COMPRISING 



AN ACCURATE AND POPULAR VIEW 



OF THE PRESENT 



IMPROVED STATE OF HUMAN KNOWLEDGE. 

 BY WILLIAM NICHOLSON, 



Author and Proprietor of the Philosophical Journal, and various other Chemical, Philosophical, and 

 Mathematical Works. 



ILLUSTRATED WITH 



UPWARDS OF 180 ELEGANT ENGRAVINGS. 

 VOL. VII. IRQ MED. 



PHILADELPHIA : 



PUBLISHED BY MITCHELL, AMES, AND WHITE. 



William Brown, Printer. 



^R-A^p- 1821. 



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