404 Proceedings of the Royal Society 
at four of the Lighthouse stations on the west coas: of Scotland, 
will, it is thought, be interesting to the Society. 
The first shock occurred on the 11th March, and was observed 
at the Lighthouse station of Hynish in the island of Tyree, and 
at Sound of Mull, near Tobermory, the distance between the two 
places being about 34 statute miles. 
The report from Tyree states : — u On the 11th current (March), 
at half-past 11 o’clock a.m., a smart shock of earthquake was felt 
all along the island ; a great many people both heard the noise 
and at the same time felt the earth to tremble. It was heard and 
felt very distinctly at the station.” Bar. 3018 at 9 a.m. 
That from the Sound of Mull says: — “ On the 11th, at 11.30 
a.m., this district was visited by a smart shock of earthquake. It 
began by a rumbling noise like distant thunder. When the noise 
was at its height the houses, and everything about them, shook, 
and the slates on the roof rattled. The shaking was not of long 
duration, but the noise was heard a considerable time before and 
after the trembling of the earth.” Bar. 29*92 at 9 a.m. 
The second shock, which seems to have been more severe, took 
place on the 23d April, and was observed at the island of Phladda, 
off Easdale, and at Lismore, at the eastern entrance to the Sound 
of Mull, the distance between the two stations being about 73 
statute miles. 
The report from Phladda states : — “ At 3.40 a.m. the Principal 
Keeper on the watch felt a severe shock of earthquake. The tower 
and dwelling-houses shook very much. All the neighbouring 
islands felt it at the same time.” Bar. 29*74 at 9 a.m. 
At Lismore the lightkeeper describes the effect as follows 
(the lighthouse clock had been under repair) : — “ I beg leave 
to report that on the morning of the 23d, at 3.30 a.m., while 
I was standing on the grating inside the lightroom I felt a 
heavy shock on the tower, with a strange rumbling sound of noise 
which lasted some seconds, and made everything in the lightroom 
shake at an alarming rate. It awoke all the inmates of the dwell- 
ing-houses. Mr M‘Leod jumped out of bed, thinking the tower 
had fallen, but afterwards thought it was a peal of thunder. I do 
not think it was thunder. I saw no lightning, and the wind was 
