208 =I. S. Hunt on the Chemistry of Natural Waters. 
No chemical examination was made of this matter held in so- 
lution by the concentrated water. From the late researches of 
Peligot, however, it appears that the organic matter precipitated 
by nitrate of lead from the water of the Seine has nearly the 
composition of the apocrenic acid of Berzelius. It gave on analy- 
sis carbon 53°1, hydrogen 2:7, nitrogen 2°4, oxygen 41°8, an 
is evidently related to the soluble form of vegetable humus. 
Comptes Rendus, April 25th, 1864). When exposed to heat 
this substance evolved ammonia, with the odor of burning wool, 
while the organic matter from the Ottawa water, on the contrary, 
gave an odor like burning turf, 
GEOLOGICAL POSITION OF THE PRECEDING WATERS, 
72. The great Paleozoic area of the St. Lawrence basin is 
§ 
divided into two basins by an axis extending from Descham- 
* 
rtance. It is in this disturbed region that by far the greater 
ta, on account of the alluvial de 
posits which generally cover the Paleozoic strata of the region, It 
is apparent that in a great number of cases the mineral springs 
occur along the lines of disturbance, and it is probable that a 
constant relation of this kind exists. the eastern limit of the 
western basin is approached, the mineral springs become more 
numerous, but this boundary passed, a region is soon” 
where the rocks become profoundly altered, and furnish 
The great western portion of the occl- 
isturbed than its eastern 
better unders: 
Paleozoic form 
| 8. Mepina,—sandstone. 
6. Hupson River,—shales. 
—shal 
