158 CHEMISTRY OF NATURAL WATERS. [IX. 



series, been made. Additional importance is given to these 

 results by the fact that the waters are all derived from pakeozoic 

 strata. We are thus enabled to compare these saline mate- 

 rials of an ancient period with those which issue from, and in 

 many cases owe their saline impregnation to, strata of com- 

 paratively modern origin ( 39). 



It is a consideration not without interest, that the valley of 

 the St. Lawrence might, under different meteorological condi- 

 tions, become a region abounding with saline lakes affording 

 sea-salt, natron, and borax, the results of the evaporation of the 

 numerous saline and alkaline springs which have here been 

 described. 



SUPPLEMENT. 



[From the Report of the Geological Survey of Canada for 1863 - 66, pages 272 - 277.] 



As further examples of saline waters of the first class, such as 

 are described in 35-40 of the preceding paper, I here give 

 the results of the analyses of two from western Ontario, both 

 which were met with in boring for petroleum. The first of 

 these is from a well on Manitoulin Island in Lake Huron, and 

 was found at a depth of 192 feet from the surface, after pass- 

 ing through the black slates of the Utica formation, and for 

 sixty feet in the underlying Trenton limestone. The water 

 was intensely bitter and saline to the taste; it contained no 

 trace of sulphates, nor yet of barium nor strontium. It was 

 not examined for bromides or iodides, which, however, were 

 probably present. The analysis of this water gave, for 1,000 

 parts, as follows : 



Chloride of sodium 4.800 



Chloride of potassium .792 



Chloride of calcium 12.420 



Chloride of magnesium 3.650 



21.662 



