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when the same phenomenon takes place on a small body of 
water like Lough Erne, that the eye can reach over, and see 
that for days together it is smooth and calm, and all of 
a sudden this ground swell takes place, it must be from 
either atmospheric pressure, or some other cause, certainly un- 
known to the unscientific inhabitants of this neighbourhood. I 
made inquiries when at Lough Neagh if the same phenomenon 
was observed there, and could not find that it was, which led me 
to think, that as Lough Erne was so much higher above the 
sea (150 feet) than Lough Neagh (40, I believe), this cireum- 
stance might make a difference in the agitation and noise, as it 
appears that the higher any lake is above the sea the more 
effect the wind has in raising its waves. In a breeze it may so 
happen that this phenomenon may take place in a greater de- 
gree in lakes of greater elevation. You mentioned that some 
similar phenomenon was observed in the Lake of Geneva. It 
appears to me that the same takes place in every body of 
water,—but so many scientific persons have lived on its banks, 
that they must have noticed it at once, and recorded it. 
‘J forgot to mention, that previous to frost the waves beat 
on the south shore, or Churchhill side, which is heard very 
faintly from our side (the north side). 
*“‘T hope you will excuse this, as it is merely the result of 
observation, and known to all the people in the neighbourhood 
of this lake. 
“7 am your’s very truly, 
‘¢ Joon Barron. 
“‘ Rev. Romney Robinson, D. D.” 
