[ 572 ] 
didances ; and this latter motion is generally 
propagated much farther than the former. 
12. The former part of this proportion wants no 
confirmation : for the proof of the latter, r oiz. the 
wave-like motion of the earth, we may appeal to 
many accounts of earthquakes : it was very remark- 
able in the two, which happened at Jamaica in 
* 1687-8 and * 1692. In an account of the former, 
it is faid, that a gentleman there faw the ground rife 
like the fea in a wave, as the earthquake palled 
along, and that he could diflinguilh the effects of it, 
to fome miles didance, by the motion of the tops of 
the trees on the hills. Again, in an account of the 
latter, it is faid, “ the ground heaved and fwelled, 
“ like a rolling fwelling fea,” infomuch, that people 
could hardly Hand upon their legs by reafon of it. 
13. The fame has been oblerved in the earth- 
quakes of *f* New England, where it has been very 
remarkable. A gentleman giving an account of one, 
that happened there the 18th November 1755, fays, 
the earth rofe in a wave, which made the tops of the 
trees vibrate ten feet, and that he was forced to fup- 
port himfelf, to avoid falling, whild it was palling. 
14. The fame all'o was obferved at £ Lilbon, in 
the earthquake of the id November 1755, as may 
be 
* See Phil. Tranf. N° 209. orvol. ii. Lowthorp’s Abridgment, 
p. 410. 
t See Philof. Tranf. vol. 1 . p. 1, ts'e. 
'I See the accounts collected together, in the 49th volume of the 
Philof. 1 rant, or in Hift. and Philof. of Earthq. and particularly 
p. 315. where it is faid, “ A molt dreadful earthquake Ihook by 
“ fliort. 
