92 



THE OBSERVATORY. 



all matter, therefore, brought down from the interior, is 

 deposited in that extensive sheet of water. 



THE OBSERVATORY. 



Mr. Keiller's observations are the more worthy of notice, 

 as for the better elucidation of the subject, he caused a small 

 moveable observatory, as depicted above, to be erected over 

 the stream, where he spent many hours daily, watching 

 the movements of the salmon. 



I give the substance of my friend's words from verbal 

 communications made to me at various times; and I also 

 subjoin some valuable drawings made by himself, which 

 tend greatly to explain his facts as well as his theories. 



