60 T. S. Hunt on the Chemistry of Natural Waters. 
careous tufa in Brant, C. W., overlying the Corniferous lime- 
stone, is distinguished by the absence of any trace of chlorids; in 
which respect it veniihas the acid waters of the fifth class from 
the adjacent region. A partial analysis of a portion of it collected 
in 1861, gave, for 1000 parts, sulphate of lime 1:240, sulphate of 
magnesia ‘207, and carbonate of lime *198. From aslight excess _ 
in the amount of sulphuric acid, it is probable that a little sul- 
phate of soda was also present. 
Of waters of this class, in which sulphate of magnesia predom- 
inates, but few have yet been observed in this country. A re 
markable example of this kind from Hamilton, C. W., was ex- 
amined by Prof. Croft of Toronto, and described by him in the 
Canadian Journal for 1853 (page 153). It hada specific gravity 
of 1006-4, and gave for 1000 parts, 
Chlorid of sodium, - - - Te ite - : 5098 
Sulphate of soda, - - = . , . - 1°6985 
6 lime, pt Oeiey etal ee ta 6 wT 
x: magnesia, - mais ist eh TTD 
81128 
sulphate of magnesia are observed to form in many localities, 
during the dry season of the year. (Geology of Canada, p. 460.) 
According to Emmons, the Post-tertiary clays near Crown 
of one of these, according to Emmons, had a specific gravity of 
to notice briefly some of the more important points in the chem- 
istry of the various waters which have been here described, and 
to inquire into their geological relations. 
