Mr D. Milne on Earthquake Shocks in Great Britain. 109 
attempted to be formed by Mr J. Drummond, shoemaker in 
Comrie, and which is still continued by him. 
It may be observed generally, of the foregoing Table, that 
there are 247 shocks recorded in it, for the two years follow- 
ing 3d October 1839 ; and that of these, 171 occurred during 
the six winter months from October to March inclusive, and 
76 during the six summer months,—a result remarkably in 
accordance with the inferences deduced in the former part of 
this Memoir. This remark, which regards only the frequency 
of the shocks, may be applied also to the severity of them,— 
the most violent having occurred, as the Table shews, during 
the six winter months. 
The author will proceed now to describe some of the more 
remarkable shocks recorded in the foregoing table, with the 
view of offering data, from which the nature of the shocks and 
the source from which they all proceeded, may be ascertained. 
He thinks that he cannot do this better, than by quoting as much 
as possible the language used by those who themselves felt the 
shocks, and who have been so obliging as to communicate 
their impressions to the author. 
He will arrange these reports under the different days on 
which the shocks occurred; and those will be quoted first, 
which were given by persons who were at the time nearest to 
what will afterwards be seen to have been the central spot, 
from which all these shocks emanated. 
38d October 1839. 
No particulars have been obtained regarding the shock which 
occurred on this day, except what are contained in the follow- 
ing extract of a letter from Mr Buchan of Blairmore, 10 miles 
ENE. of Comrie. 
* About 3 p.m., I was walking, when I heard a sound some- 
what resembling a peal of thunder at a great distance,—or 
rather the echo which succeeds a louder thunder peal passing 
along through the clouds. I would have believed it was from 
thunder, had I not felt the motion of the ground under me, 
as if a heavy carriage had passed over it rapidly at a short dis- 
tance from me. The sound preceded the movement of the 
ground about 3” or 4”.” 
