262 Proceedings of Royal Society of Edinhu7''gh. [march 19, 
we felt a shock of earthquake, which lasted about ten seconds, 
accompanied by a dull, heavy rumbling sound. I came off watch at 
4 A.M., and was in bed at the time of the shock, but not asleep, and 
I felt the bed, as it were, bodily lifted from the ground, and some 
of my children were awakened out of their sleep by the sound. The 
lightkeeper in the tower felt himself going backwards and forwards 
on the chair on which he was sitting.” Barom., 29*86. 
Ardnamurchan . — The lightkeeper writes as follows : — “ I was on 
watch in the lightroom when the earthquake occurred. I first heard 
a noise as if some heavy weight had fallen, but no shock, and in 
about one minute afterwards a similar sound, but much louder, with 
a distinct upheaval but no oscillatory movement. It occurred at 
4.40 A.M. (dial time, 5.5 Greenwich). The whole time it lasted did 
not occupy more than three or four seconds. The lightkeeper, who 
had retired to rest at four o’clock, had not been asleep. He and his 
wife heard a low rumbling noise, as if of distant thunder, but no 
perceptible movement. The noise was not so loud as to awaken 
any of the others at the station who were asleep.” Barom., 29*73. 
Lismore . — The lightkeeper on watch “ distinctly felt and heard the 
noise of the earthquake. It began at 4.45 a.m., and continued one 
and a half minute. The noise was pretty loud, and awakened all 
the inmates at the station.” Barom., 29*91. 
This earthquake took place in the month of February, thus adding 
one more to the already long list of British earthquakes happening 
during the winter months — from November to the beginning of 
February. The diagram of British earthquakes, fig. 1, for the last 
eight years is sufficient to show this tendency. The shock occurred 
during cold, wet, and stormy weather, the average rainfall for 
January from five stations on the line of the Great Glen being 
4*27 inches, the previous summer and spring having been unusually 
dry. The barometer was falling very uniformly over the whole of 
Scotland at the rate of \ inch in twelve hours. There was no 
steep barometric gradient. In the vicinity of the Great Glen the 
average height of the barometer for eleven stations was 29*7. The 
thermometer was falling over Scotland, the average at 9 p.m. on the 
previous evening being 32°, and at 9 a.m. on the 2nd 39° F. The 
moon at the time was in perigee ; it was nearly on the meridian, 
and the earthquake occurred shortly (five days) after full moon. 
