240 DR. CHARLES DAVISON ON THE [Allg. I904, 



and Bodfeirig. The boundary of the disturbed area and the position 

 of the epicentre must have coincided nearly with those of the after- 

 shocks of June 19th, 11.8 a.m. (/) and June 21st, 8.6 a.m. (<j). 



d. June 19th, 10.12 a.m. 



Intensity, 3. Number of records, 2, from 2 places. 



A slight tremor was felt at Penygroes, and a tremulous sound was 

 heard at Eethesda. The epicentre probably coincided with, or was 

 not far distant from, that of the preceding after-shock (c). 



e. June 19th ; 10.16 a.m. 



Intensity, 3. Number of records, 2, from 2 places. 



A tremulous sound w T as again heard at Bethesda. At Bettws 

 Gannon, a slight tremor was felt, lasting about 2 seconds, accom- 

 panied by a sound like very faint distant thunder. 



June 19th, 10.23 a.m.: Bethesda. — A tremulous sound. 

 June 19th, 10.48 a.m.: Penygroes. — A slight tremor. 



/. June 19th, 11.8 a.m. 



Intensity, 3; epicentre, lat. 53° 7*6' N., long. 4 C 143' W. iN umber of 

 records, 7, from 7 places (fig. 2, p. 239). 



The seven places of observation lie within an elliptical area, 20 

 miles long, 13 miles wide, and 219 square miles in area. The 

 centre of the area is 8 miles north-east of that of the principal 

 shock, and the direction of its principal axis N. 47° E. and S. 47° W. 

 A slight tremor was felt at every place, accompanied at Clynnog, 

 Nantlle, Penygroes, and Gaerwen by a faint rumbling sound. 



June 19th, 12.5 p.m. : Bodfeirig.— A slight shock. 



June 21st, O.20 a.m. : Upper Clynnog. — A shock, accompanied by a sound 

 like that of the tipping of quarry-rubbish. 



g, June 21st, 8.6 a.m. 



Intensity, 3. Number of records, 5, from 5 places. 



The boundary of the disturbed area and the position of the epi- 

 centre were nearly the same as those of the after-shock on June 19th, 

 11.8 a.m. (/, fig. 2, p. 239). A slight shock was felt at Nantlle and 

 Penygroes, and a rumbling sound was heard at Bodfeirig, Clynnog, 

 and Newborough. 



June 21st, about 9.6 a.m : Clynnog.— Sound heard. 



June 22nd, 4.20 a.m. : Penygroes. — A slight shock, accompanied by a 

 rumbling noise. A slight shock was also felt at Penllech during the same 

 morning, but the time is not given. 



June 23rd, about 5.31 a.m. : Nantlle. — A very slight shock. 



