Charles Davison—British Earthquakes. 297 
dotted line. In form it is roughly circular, but from the north-west 
quarter there is no evidence of a reliable character. This portion 
may therefore be incorrectly drawn, but the position of the epicen- 
trum in all probability does not differ greatly from that given above. 
Assuming the accuracy of this boundary line, the area disturbed 
must have been about 124 miles in diameter and have contained 
about 120 square miles. 
Second Shock: May 17. 
Time of occurrence, about 1h. 80m. Intensity, nearly V. Hpi- 
centrum, 34 miles N. 15° W. of Helston, i.e. in lat. 50° 8’ 30” N.,: 
long. 5° 18’ 0” W. 
Disturbed Area and Intensity.—The following discussion is founded 
on 70 records from 40 different places. These places are shown on 
the accompanying map, which, with the exception of the dotted line, 
refers entirely to this earthquake. For so slight a shock the number 
of records is unusually great, and this is due to the kindness of 
several gentlemen who, at the cost of much trouble, made further 
inquiries within and near the disturbed area. The Rey. Canon 
Rogers, of Gwennap, has sent me several accounts from that village, 
from Redruth and other places; accounts which have added very 
materially to our knowledge of the shock. For six records from 
Marazion I am indebted to Mr. Fortescue Millett, and for others 
from the neighbourhood of Hayle to Dr. Cleaver, of Hayle, and the 
Rev. F. Hockin, of Phillack. 
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The intensity of the shock was greater than IV. but not quite V. 
at Helston, Nancegollen, Penrose, Porthleven and Wendron; IV. at 
