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by which they were probably formed. It is from this 

 view, that I am induced to invite the attention of the 

 naturalist more particularly to them, and to propose the 

 following questions for his observance. 



13th. Whenever two or three alluvial banks, of the 

 above description occur, what is the course of the river 

 through the entire extent of such district? 



1 mention " such district/' because in some cases, a 

 spur of a mountain, or ridge of rocks, crosses a valley, 

 breaks off at a river, and interrupts the extension of 

 those alluvial banks, and also occasions a bend or dif- 

 ference in the course of the river, below which the al- 

 luvial banks occur again, &c. 



14th. What is the mean breadth of the first inter- 

 vales, or alluvial banks next to the river, and what 

 their height? 



15th. What is the mean height and breadth of the 

 second alluvial banks, on each side of the river ? 



16th. Do they ascend or descend towards the moun- 

 tains or hills ? 



17th. Of what do those districts appear to be com- 

 posed, at a small depth below the surface, and to the 

 greatest depth to which they have been explored? 



18th. Of the component parts, which is the most 

 predominant; sand or clay, &c. ? 



19th. Do springs of water occur, at the foot of the 

 second alluvial banks generally ? 



20th. Have mineral springs been known to occur in 

 those districts, and what are their properties? 



