

Entered according to the Act of Congress, in the year 1840, by ORRIN 

 ROGERS, in the Clerk's Qffrce of the District Court for the Eastern District of 

 Pennsylvania. 



ERRATA. Page 52, last line, for "not usually" read "naturally," in part of 



the edition. 

 Pages 199 and 200, for "desiccation" read "defecation." 



