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



ing been a heave which lifted every thing upwards and for- 

 wards as in a ship at sea. Indeed, on no other supposition is it 

 possible to account for the different effects produced on walls, 

 — those rent vertically, being generally at right angles to those 

 which were rent horizontally, and which last leaned or tumbled 

 over. 



One intelligent observer at Crieff (Duncan Brewster), gave 

 to the author the following explanation of his sensations. He 

 felt himself first moved eastward from 1 to 2, — then back to 

 3, — and, lastly, from 3 to 1. 



3 1 2 



WEST.I 1 [EAST. 



5. A sound accompanied the motion of the earth. At Comrie 

 it is said to have been " indescribably terrific ; that of water, 

 " wind, thunder, discharge of cannon, and the blasting of rocks, 

 " appeared combined" in it. At a place half a mile east of 

 Crieff, the shock of 12th October 1839 was accompanied by 

 " a loud explosion, as if from a ten-pounder at a mile distant.**' 

 At Lawers (\.h mile east of Crieff), the noise on 23d October 

 1839. "was exactly like the nearest and loudest peal of thun- 

 der ; only, instead of being over head, it seemed to rise up 

 immediately under the house.'' At Dunira (2^ miles west of 

 Comrie), the noise on the 12th October 1839, is described as 

 '' most tremendous, — not unlike the blowing up of a magazine."" 

 At Monivaird (4 miles east of Comrie), the noise on 23d Oc- 

 tober 1839 is said to have been " a loud roar, like that of the 

 blast-furnaces in a large iron-work." At Crieff, on the same 

 occasion, the noise is stated by one observer, to have been 

 *' tremendous ;'' and, according to another, " was as loud as if 

 * a sixty-pounder had been discharged at the bottom of a coal- 

 '• pit, 300 or 400 yards away." This same observer adds a 

 most remarkable fact, — " Immediately after the shock, I got 

 " out of bed, and, on looking from my window, beneath which 

 "- were a number of trees, I observed that their branches were 

 '* all bent towards the east, as if a strong gale were blowing 

 " on them. I looked till they recovered their erect position, 

 " after which not a leaf moved. During the time, I heard a 



