and Geology of Lake Ontario. 83 



yards. This breadth gradually diminishes, as is shown in the 

 following admeasurements, taken (like the one just stated) from 

 the maps of the Boundary Commission under the 6th and 7th 

 articles of the Treaty of Ghent. They are so taken as to ex- 

 hibit the mean progressive contractions. Miles. 



At 6 miles direct below Kingston, at the upper end \ g 

 of Howe Island / ^ 



At 11^ miles ditto at the lower end of ditto... 6|- 



At Gananoque to the S.W. angle of a great bay on "^ „ g 

 the South Main ^^^'^ 



At 3 miles direct below Gananoque, across the bot-1 „ ^j 

 torn of Grindstone Island J ^"^ 



At 7f miles direct below ditto across the bottom of 1 , 

 the smaller division of Wells Island j 



At across the head of Tar Island 2| 



At 5^ miles direct below last point, and across the \c, a 

 bottom of Grenadier Island J ^^ 



At If mile direct below Block-house Island* to thel ^ , 

 bottom of Chippewa Bay j T7 



At Chippewa Point on the S. shore 2^ 



From Chippewa Point a gradual but considerable contrac- 

 tion ensues for 3f miles downward ; with tolerably regular 

 shores. About three miles, above Brockville, at a spot some- 

 what crowded with islands, the outlet is only 1500 yards broad, 

 and opposite to that town it is exactly a geographical mile 

 across. 



It would be useless and tedious to describe in detail the very 

 intricate district of waters now under consideration. Its shores 

 are of mingled rock and marsh ; the former never rising higher 

 than 150 feel, and seldom so much. The occasional patches 

 of level and productive land are usually in the larger islands. 

 The main and islands are broken into innumerable rushy 

 coves and inlets; the larger receiving creeks which are bor- 

 dered by morasses for some distance into the interior. These 

 indents are sometimes large, particularly on the south main 

 shore, as Candelles Bay 2\ miles broad, and 1535 yards deep ; 

 and twenty-one miles above Brockville; Goose Creek Bay 

 thirteen miles above that town, and Chippewa Bay a little be- 

 low the last named bay, and nearly two miles deep. These 

 are all on the south shore. 



The islands crowded into this space are upwards of seventeen 

 hundred in number, as ascertained by the Boundary Com- 

 mission. They are largest at the upper end, and most nu- 



• Block-house Island is 7i"j miles below the liead of Tar Island, and 

 123 niilcj above Brockville. 



M 2 merous 



