370 DR. CHARLES DAVISON 01* THE [Aug. 1907,. 



its centre being 2| miles north of Menstrie. The sound was heard 

 by 78 per cent, of the observers, and was generally compared with 

 the fall of a heavy body or with an explosion. From the rapid 

 decline in intensity of the shock outwards from Menstrie, it follows 

 that the focus was situated at a slight depth and that the epicentre 

 was close to Menstrie. 



(30) 1906, December 29th, 1.30 p.m. 



A slight shock, accompanied by a noise like the fall of a heavjr 

 body, was felt at Airthrey. 



(31) 1906, December 30th, about 1 a.m. 

 A shock, which woke several people, was felt at Menstrie. 



(32) 1906, December 30th, 2.10 p.m. 



A very slight, but distinct, shock (intensity 3) was felt at 

 Airthrey, Alva, Dunblane, Menstrie, and Red Oarr.S The sound 

 resembled that caused by the fall of a heavy body. 



(33) 1906, December 30th, 4.15 p.m. 



Intensity, 6; centre of isoseisrnal 4, in lat. 56° 10-8' N., long. 3° 513' W. 

 Number of records, 13, from 8 places, and 6 negative records from 5 places 

 (fig. 3, p. 369). 



The average of 10 estimates of the time is 4.15 p.m. The dis- 

 turbed area is about 11 miles long and 8| miles wide, and contains 

 about 82 square miles, its centre being about 2 miles north of 

 Menstrie. The intensity of the shock was 4 at Alva, Dunblane, 

 Stirling, and Tillicoultry, and 6 (according to three observers) at 

 Menstrie. The sound was heard by all the observers, and, in 

 50 per cent, of the records, was compared either with the fall of a 

 heavy body or with an explosion. The beginning and the end of 

 the sound coincided, as a rule, with those of the shock. 



(34) 1906, December 31st, 1 a.m. 



A shock was very generally felt at Menstrie, strong enough to 

 awake persons, and was accompanied by sound. 



(35) 1907, February 10th, 5.40 p.m. 

 A slight shock was felt at Menstrie. 



(36) 1907, March 19th, 7.33 p.m. 



Intensity, 5. Number of records, 6, from 4 places. 



A shock, rather stronger than usual, was felt at Airthrey, Alva,. 

 Bridge of Allan, and Menstrie. It consisted of two prominent 

 vibrations, and was accompanied by a loud report like that of an 

 explosion. 



