ERRATA. : 
_ Page 124, for Track No. IV. read No. V., and for Track No. V. read No. IV.; 
these numbers and their paragraphs should have been thus transposed, in order 
to agree with the map.—P. 126, 1. 13 fr. top, after appears, insert not.— ‘i 
fr. bot. for basis, read basin.—lIn the note, p. 129, 1. 6 fr. bot. after by, ineast the 
displacement of. ‘ 
