266 Geology and Mineralogy of the 4 



ter, is a curious fact, and appears to lead to the conclusion 

 that the great solvent medium (according to Theories) may 

 have been, af the same moment, charged with several forms 

 of mineral substances in fields or districts; and without any 

 evident barrier to prevent their commixture — a supposition 

 which involves a perfect state of repose or a steady motion 

 as in rivers, equality of specific gravity and of fluidity, &c. ; 

 of none of which conditions are we assured. 



In Lake Huron the brecciated and vesicular species of 

 Michilimackinac, the quartzose of the Grand Manitou and 

 Drummond, and the odorous variety of the Lesser Manitou 

 are on the same level. 



The soft and brown kind of St. Joseph and the light col- 

 oured schistose and non-organic* of the Lesser Manitou are 

 both on the level of the Lake also. 



Lake Ontario presents similar appearances; extending 

 to sandstone. At Sackets Harbour thirty-five miles from 

 Kingston the limestone is of a very deep blue, and com- 

 monly largely studded with very convex bivalves. At the 

 latter place on the same plane, the limestone is brown 

 and blue, without a shell (as far as I saw) and abounding in 

 tremolite. At Gauanoque at the head of the one thousand 

 islands, on the same level with the limestone of Kingston is 

 a white quartzy sandstone which continues to line the de- 

 scent of the St. Lawrence to Montreal, covered by lime- 

 stone. Further, if it be allowed (and I believe it must be) 

 that during the first three miles from Lake Ontario, the Gen- 

 essee River does not ascend eighteen feet, we shall then 

 have the first flsetz sandstone of that locality, the blue and 

 brown limestone of Sackets Harbour and Kingston, and the 

 white sandstone of Gauanoque on the same parallel of height. 



I have been induced to enter into these digressions, from 

 their being the vehicles of new facts respecting the Geology 

 of unexamined countries. 



To return, the rocks of the Western part of the Manitou- 

 line Islands are so deranged, and so concealed by debris 

 and vegetation that it requires opportunities superior to 

 mine to ascertain correctly the nature of the successive 

 strata from the level of the Lake to the summit of the Grand 

 Manitou. 



* Without organic remsdns, 



