210 TT. S. Hunt on the Chemistry of Natural Waters. 
Of the waters of the second class, of which about thirty have 
been examined from the western basin, some five or six issue 
from the shale formations Nos. 5 and 6, but all the others are 
from the underlying limestones. The bitter salines of the first 
class flow from the limestones of the Trenton group, with the 
exception of that of Ancaster, which is from a well sunk in the 
iagara formation, and that of St. Catherines, from a boring 
carried through the Medina down into the Hudson River shales. 
an 
resale while the others have their source in the underlying 
limestones, and are more or less modified in their ascent. Agail, 
at Sabrevois, within 
e seconG 
class, of which on and the 
