376 Mr D. Milne on Earthquake-Shocks felt in Great Britain, 



2d July 1843. — Cloudy ; slight drizzle on hills ; fine Scotch 

 mist after 3 p.m. ; rain in evening. 



^th July 1843. — Dull day ; cloudy, with showers ; rather 

 cold. 



2hth August 1843. — The day in succession, cloudy, cold, 

 showery, and close. There was rain from 2 to 4^ p.m. 



Mr M'Farlane reports, that the index of the long spiral 

 pendulum in the steeple at Comrie, made a rut in the pow- 

 der } of an inch in a direction W. by N. There was no dis- 

 turbance of the powder, on the opposite side of the central 

 point. At Kingarth (about two miles north of Comrie), the 

 inverted pendulum vibrated in a S.W. and N.E. direction. 

 The horizontal pendulum intended to be affected by an up- 

 ward movement of the ground, sunk fully half an inch. At 

 Clatheck, the shocks produced no undulation, but a considera- 

 ble tremor. 



At the instant of the shock, the barometer and thermome- 

 ter were respectively 29,5 inches and 56° ; five minutes after 

 the shock 29,5 inches and 55°. 



In examining the list of shocks just given, it will be per- 

 ceived that the height of the barometer was, with scarcely one 

 exception, on the day of their occurrence, lower than its aver- 

 age height during the month. Farther, it would appear that, 

 on the 23d March 1843, the barometer, at the instant of the 

 two shocks, was lower than the average of the day on which 

 they occurred. It is matter of regret, that the height of the 

 barometer, at the instant of all the shocks, was not marked. 



