Collingwood to Sarma. 141 



pursued in Nattawasaga Bay may be formed from the know- 

 ledge that the average daily take exceeds 1,000 fish, weighing 

 from 1 to 40 lbs. each, and are carried principally to the 

 Toronto market. Most of the larger trout spawn about the 

 islands upon beds of calcareous rock, over which a shifting 

 drift of sand and gravel passes by the action of the waves, 

 where the water is shallow ; and from being exposed to the 

 sun, the temperature of the lake is warmer at these localities 

 than elsewhere. 



The steamers leaving Collingwood for Mackinaw and 

 Chicago are of a large class, affording good accommodations 

 to travellers. 



FROM COLLINGWOOD TO SARNIA. 



From Collingwood the tourist, if desirous of seeing the 

 beauties of Lake Superior, than which, during the heats of 

 summer, there is no more pleasant tour, can take steamer for 

 Ste. Marie ; we, therefore, will give a cursory description of 

 the scenery on that Lake, which has several remarkable 

 features connected with it. Its waters are so perfectly tran- 

 sparent that they render the rocks at great depths distinctly 

 visible. The temperature of summer is never gained by 

 these waters, they being even at midsummer exceedingly 

 cold. A fathom or two below the surface, it is but a few 

 degrees above the freezing point in August. In the western 

 portion the water is much colder than in the eastern — the 

 surface flow becoming warmer as it advances to the outlet. 

 A mirage is of frequent occurrence, occasioned by the 

 difference between the temperature of the air and the lake. 

 Great difficulties are experienced from this cause in making 

 astronomical observations. Lanman states that its water is 



