ERRATA. 
Page 1, second note, for “Chart II,” read “ Chart I.”—P. 12, line 9 from top, for “ vor- 
tica,”’ ed * vortical.”—P. 308, line 9 from top, for “ Persia,” read “Russia.”—-P, 314 
line 17 from bottom, for “ river; ” read “newer.”—P, 312, line 8 from top, for “ semi-’ 
monthly,” read “ bi-monthly.” 
