T. 8. Hunt on the Chemistry of Natural Waters. 207 
In the case of the Chambly water of 1852, which contained in 
1000 parts ‘073 of silica, (042 parts still remained in solution in 
the water evaporated to one twentieth; and in that of the Ottawa 
___ River when reduced to one fortieth there still remained in solu- 
.. tion from 10-000 parts of water, ‘075 of silica and 028 of lime. 
2 Similar results were observed with the alkaline saline waters of 
Varennes and Fitzroy, and all of these yielded, by further evap- 
oration, precipitates containing silica and lime, and in one in- 
stance magnesia. 
It is not however from alkaline waters like these, but from 
Matters as to evolve an odor like burning horn when exposed to 
heat. (Geology of Canada, 462.) 
he Ottawa water (§ 45) when boiled to one-tenth co a a 
precipitate in small bright brown iridescent scales. This was 
_ 42 organic substance*which was dissolved in a dilute oo 
a i ; y: 
‘isting Partly of organic matter. 
