264 Proceedings of the Royal Society of Edinburgh. [Sess. 
(23) 1906, October 8 , 8.16 a.m. 
A shock (intensity 4) was felt at Airthrey, Alva, Blairlogie, Bridge of 
Allan, Dunblane, Logie, Menstrie, and Red Carr. The disturbed area was 
probably about 9J miles long, 6 miles wide, and 45 square miles in area. 
The shock consisted of two vibrations, lasting not more than two seconds, 
and was accompanied by a sound resembling that of a muffled explosion. 
(24) 1906, October 12, 7.20 a.m. 
A distinct shock, felt at Menstrie. 
(25) 1906, October 20, 7.15 a.m. 
A slight tremor, with sound, observed at Airthrey. 
(26) 1906, October 24, 7.11 p.m. 
A report, like that of a distant cannon, heard generally at Menstrie. 
(27) 1906, October 26, 7.15 p.m. 
A slight shock, felt at Airthrey and Menstrie; the shock consisted of 
two vibrations at Menstrie, and at Airthrey was accompanied by sound. 
(28) 1906, October 30, 12.15 p.m. 
A slight shock and sound, observed at Menstrie. 
(29) 1906, December 28, 4.12 p.m. 
Intensity, 6 ; centre of isoseismal 4 in lat. 56° ll'*3 N., long. 3° 5F'0 W. ; 
number of records, 10, from 7 places, and 5 negative records from 5 
places (fig. 4). 
The shock was felt at Airthrey, Alva, Burnside Farm (Braco), Dunblane, 
Menstrie, Red Carr, and Tillicoultry. The disturbed area was probably 
about 11 miles long, 8^ miles wide, and about 74 square miles in area, 
its centre being 2J miles north of Menstrie. The intensity of the shock 
was 6 at Menstrie. The sound was heard by 78 per cent, of the observers. 
From the rapid decline in the intensity of the shock outwards from 
Menstrie, it follows that the focus was situated at a slight depth. 
(30) 1906, December 29, 1.30 p.m. 
A slight shock, accompanied by a noise like the fall of a heavy body, 
felt at Airthrey. 
(31) 1906, December 30, about 1 a.m. 
A shock, felt at Menstrie. 
