and especially in Scotland. 103 



have been able to collect information, the shock was much 

 more severely felt on the low lands, along the banks of the 

 Forth, than on the rising ground which rests on different 

 strata." 



In a subsequent letter to the author, Mr Jeffrey gives some 

 farther particulars. He says that " the first heavy undulation 

 proceeded, as nearly as I have been able to ascertain, from N. 

 by E. or N.NE. to S. by W. or S.SW. No tremulous motion 

 whatever began, until the first undulation passed. I find I 

 have not stated quite accurately, in my previous account, the 

 motion of the clock. It was thrown from the north wall of 

 the house, by which it stood, to the south, and was moved five 

 or six inches off the perpendicular by the first shock. Of 

 course, both clock and wall were off the perpendicular at the 

 same time. But as the clock was not attached to the wall, 

 when it returned back to its original position it seemed to rock 

 and swing for a space, until it recovered from the forward im- 

 pulse which it had received. It made a considerable noise, 

 as did also the crockery in the room. There were only three 

 undulations, or rather one undulation and tn-o tremulous mo- 

 tions. The first undulation we have already noticed. The 

 first tremulous motion proceeded from the west to the cast, at 

 about right angles to the line of movement of the heavy un- 

 dulation, the direction of which is stated above ; then the 

 second tremulous motion proceeded from the east to the west, 

 at about right angles to the same line. Now, these cross tre- 

 mulous motions, which were partly undulatory, were concave 

 and not convex. The site of the house, which was first moved 

 by these slight cross shocks, sunk. The motion was very much 

 like that of a ship, when struck by a heavy sea ; she lurches 

 over to the one side, and as she falls down between the two 

 waves, she gradually rights, until the masts become perpen- 

 dicular, without the side which dipped into the water first 

 being elevated at all ; that side does not rise, the other side 

 only comes down to the same level wath it. I may likewise 

 state, that these two tremulous motions, at right angles to the 

 path of the first undulation, did not appear to me to be occa- 

 sioned so much by distinct shocks., as they seemed to be some- 

 thing like the settling down of the earth, after the iirst undu- 



