ERRATA. 



P. 42, line ii from the bottom, for "of," read "on." 



P. 53, line 9, for "Plate III, fig. i," read "Plate II, fig. i." 



P. 69, line 6 from the bottom, for "Plate III, fig. i," read 



"Plate III, fig. 2." 



P. 71, line 10, for "steam," read "stream." 

 P. 54, line 10. The statement that certain areas appear on 

 the map without definite boundaries is not in accord- 

 ance with the fact. Owing to a misunderstanding on 

 the part of the lithographer, the areas in question are 

 delimited by the usual dotted line. 



