ERRATA. 



In Plate IX, fig. 3, for S, read P. 



Page 219, line 11, for North Virginea, read Nerita virginea. 



220, line 32, for vol. x. to xxiv. read vol. x. tab. xxiv. 



220, for Rev. Dr. Daubeny, read Charles Daubeny, MD. 



364, line 4, for By his, read By this. 



365, end of Prop. VII. for arcs, read areas. 



3T4, line 20, for -,(Tr-l E), read p(Ti- T' E). 

 383, line % for world, read wind. 



