EXPLANATION OF ‘“VICE-COUNTIES.” 189 
the watershed line parting the East and West sides of 
Scotland. 
t19.—Donegal county, includes Londonderry city. 
137 and 138.—Mayo E. and W., separated by the rail- 
way from Ballina to the head of J.ough Mask. 
139 and 140.—Galway W. and E., separated by Lough 
Corrib. 
143 and 144.—Tipperary N. and S., divided by the 
line of watershed. 
146 and 147.—Cork N. and S., divided by the River 
Lee. 
In applying these definitions, it should be remembered 
that they are based on old maps, and on the political 
divisions of counties which existed at the time of Mr. 
Watson’s work commencing. Modern maps do not show 
all the out-lying detached portions of counties here de 
scribed. 
