Mr. J. Drummoncrs Table of Earthquakes at Comrie. 241 



In 1841, the end of June and beginning of July were wet 

 nearly every day until the 13th of July, when we had good 

 summer weather. After the shock the weather got cold and 

 stormy, and on the 29th of July we had a regular hurricane 

 from the north-east, doing much damage. After the great 

 shock on the 30th the weather got mild : I observed that the 

 shock was transmitted much further in the direction of the 

 hurricane than in any other. 



The greatest shocks happen in summer and harvest. The 

 vertical shocks, I cannot find, are felt further south from the 

 Lednoch quarries than Comrie, on the east further than Tam- 

 perran, or on the south-west than Leachkin, being all about half 

 a mile distant. At Kinggart, the nearest house on the north 

 and a mile off, the shocks, vertical at Comrie, &c., are felt la- 

 terally. The greatest of the lateral shocks are nothing in 

 comparison with the greatest of our vertical shocks, and yet 

 the people of Comrie are more afraid of the lateral shocks 

 than of the others. It is considered here that the shocks 

 originate in the mountains, some referring them to Dunira 

 Hill, some to the Cluan, and some to Kinggart. Upon this I 

 will observe, that, on the 12th of October 1839, the people 

 living in those parts observed five shocks, while on the same 

 day at Bruckhill and Saures eight were observed, and at 

 Comrie ten; on the 23rd following, the people about Dunira 

 and Cluan observed three, while at Comrie some observed 

 fourteen, others eighteen, and some as many as twenty. On 

 the 30th of July, 1840, the Dunira people observed six, and 

 at Comrie fourteen were observed. In general, the shocks 

 are not felt at equal distances in every direction : I think the 

 greatest shocks are felt further north-east and south-west than 

 in any other direction. The shock of the 30th of July, 1841, 

 was not felt at Stirling, twenty-four miles south. Shocks are 

 not felt in every place. Those who are placed on high ground 

 do not observe them near so readily as those on low ground ; 

 and they have been felt in coal-mines at Stirling when they have 

 not been felt on the surface. They are not felt alike in Comrie, 

 one house built on a rock not feeling them at all so severely as 

 the others. So slight are the shocks, that to a stranger they are 

 often inajipreciable, the ground moving very little with a shock 

 that is felt over a diameter of twelve or twenty-four miles in dia- 

 meter: it is only those that are felt forty miles and upwards in 

 diameter which cause any alarm. With regard to any external 

 appearance, the only thing I have heard of is from the shep- 

 herds watching on Dalengrass, who tell me that they have often 

 observed a thin cloud stretched over the part of the Lednoch 

 valley, which I have assigned as the seat of the disturbance. 



Phil. Ma". S. 3. Vol.20. No. 130. March 1842. R 



