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LETTER XXI. 
To Dr. John Stevenfon, Phyjician at Edinburgh. 
Communicated by Dr. John Pringle, F. R. S. 
Scotland, at Loch Nefs. 
Dear Sir, 
Read Jan. 8, T Have your favour of the 20th, and 
>756- compliance w^ith your requeft, I 
give you the following reply to your queries. 
I arrived at Fort-Auguftus, from Fort- William, 
on the 31ft of Odfober laft : next morning about ten 
I walk’d abroad, when the barrack-mafter, arid feve- 
ral others, came and acquainted me, that they had * 
feen a very extraordinary agitation of the waters at 
Loch Nefs. I refufed giving credit to their ftory, and 
a little afterward returned to the fort. 
About 1 1 , my clerk and the brewer at that place 
came and acquainted me, that a more extraordinary 
agitation than the former had happened, and they 
apprehended fome danger to our brewery, which is 
lituated where the river Oich difcharges itfelf into 
the lake. I walked then to that place, but 'before 
mv arrival the water had returned to its ufual cha- 
nel. I faw very clearly the marks on the banks, to 
which it had flowed ; the banks were quite wet, and 
a ftrip of leaves of trees and twigs, &c. left on 
them. I inquired then into this affair, and the 
account the fpedlators gave were, that they ob- 
ferved the river Oich, which runs from weft into 
the head of the lake, fwell very much, and flow up 
the river from the lake, with a pretty high wave,' 
about two or three feet higher than the ordinary fur- 
D d d 2 face, 
