246 ACCOUNT, &c. 
extent or force. The rumbling noifes or flighter concuf- 
fions, as ufual, are obferved at Comrie, in Glen-Leadnach, 
and the places in their near neighbourhood ; the more violent 
extend to much the fame diftance as formerly defcribed. Having 
been only occafionally in that country fince February 1791, I 
have not been able to afcertain dates. On the 2d of September 
1791, at five minutes paft five in the afternoon, a flight fhock 
‘was felt at Ochtertyre. The barometer was not in order, on 
which account the weight of the atmofphere could not be ‘afcer- 
tained. Its electrical ftate was tried by Saussure’s electro- 
meter, but no indication of any thing uncommon was per- 
ceived. Since that period, fhocks have been obferved at diffe- 
rent times till within thefe few weeks patt. 
From this account, it will be obferved, that all the greater 
fhocks have taken place in the feafon of autumn or the begin- 
ning of winter ; that this has been now repeated for more than 
four years ; and that thofe greater fhocks have been fucceeded 
_ at fhort intervals by rumbling noifes or more feeble concutflions. 
It has alfo been remarked, that they have in general been pre- 
ceded or followed by great rains or boifterous weather; but 
variations in the weather take place fo frequently in our cli- 
mate at that feafon of the year, that the connection between 
them and the phenomena above defcribed, is probably altoge- 
ther accidental. 
a 
XII. 
1ox) 
