94 Geological Survey of Canada. 



at a distance of six feet from the shore. It was clear and transparent, 

 and, unlike the water of the Ottawa, exhibited no color in vessels several 

 inches in diameter. The recent water gives a considerable precipitate 

 with salts of baryta, and a slight one with nitrate of silver. When boil- 

 ed it lets fall a white crystalline precipitate which adheres to the sides 

 of the vessel, unlike the deposit from the Ottawa water. A little yellow 

 flocculent matter appears suspended in the concentrated liquid, which is 

 only slightly colored, and the dried residue contains much less organic 

 matter than that from the last mentioned water! The residue from two 

 litres, when dissolved in hydrochloric acid, sufficed to give distinct re- 

 actions of iron and maganese. The ammoniacal precipitate from this 

 solution was in great part soluble in potash, and was alumina. From a 

 second portion of two litres a precipitate of phosphate was obtained by 

 molybdate of ammonia, less abundant however than from the same quan- 

 tity of the water from the Ottawa The determinations were made as in 

 the previous analysis, and gave for 10,000 parts, 



Carbonate of lime, 0-8033 



" "magnesia, -253? 



Chlorine, -0242 



Sulphuric acid, -0687 



Silica, -3700 



Chlorid of potassium, -0220 



" "sodium, -1280 



Residue dried at 300° F., 1-6780 



" ignited, 1-5380 



When evaporated to one-fortieth this water still contains in solution a 

 portion of silica and some lime. The silica thus dissoved was found 

 equal to 0-075, and the lime to 0-050 of carbonate of lime for 10,000 

 parts. The proportions of sulphuric acid and chlorine are much larger 

 than in the Ottawa water, but were found not quite sufficient to satu- 

 rate the whole of the alkaline bases present. The small portion of lime 

 is probably held in solution by the concentrated water in the form of 

 silicate, which, as is well known, possesses a certain degree of solubil- 

 ity; while from the insolubility of the silicate of magnesia, this base is 

 completely separated during the evaporation. 



I subjoin the calculated results for 10,000 parts of the St. Lawren6e 

 water, the lime and magnesia and the slight excess of alkalies being 

 represented as carbornates. 



Carbonate of lime, 0-8083 



" " magnesia, -253*1 



Silica, -3 700 



Chlorid of potassium, -0220 



" " sodium, -0225 



Sulphate of soda, -1229 



Carbonate " -0061 



Alumina, phosphoric acid, (traces.) 



Oxyds of iron and manganese, " 



1-6055 



