68 On the Falls of Niagara. 



of America ? And is it not probable, that many of 

 the supposed earthquakes of that country (Canada) 

 are nothing more than huge masses of stone tumbling 

 into the chasm at the Falls ? 



I remain, Sir, &c, 



Your friend and pupil, 



Felix Robertson. 



Philadelphia, February 9th, 

 1805. 



P. S. On an elevated piece of ground, ten or 

 twelve miles west of the Falls, I had, at the same 

 time, a distinct view of the two Lakes, Erie and 

 Ontario, and the column of cloud, or vapour, arising 

 from the Falls. I have specimens of the stone from 

 the top of the Table-Rock, and from the bottom, im- 

 mediately under it. I have not yet examined them, 

 with sufficient care ; but I find, that neither of them 

 effervesce with the sulphuric, nitric, or muriatic 

 acids, which shows that they are not carbonates of 

 lime. The whirlpool, three miles below the Falls, 

 exhibits nearly as curious and magnificent an appear- 

 ance as the Falls themselves. 



