( ^7 ) 
ing yet agreed on the Nature or certain Caufes of 
Earthquakes, I pafs bn to the fecond Thing which 
I propofed to enquire into, viz. what Kind or Sort 
of Earthquake ours was. Gilbertus Jacchaus in 
his Infiitutmm Phyjica, cap. Terra Mot us di~ 
ftinguifhes Earthquakes into four Species ; where- 
in he agrees with Arijiotle and Tltny, with whom 
the firft Species is a Shake or Trembling, and by 
them liken’d to the fliaking Eit of an .Ague, I can- 
not yet hear of any Breach or Opening of the Earth, 
through the whole Extent of our Earthquake. It 
has been faid by feme that were abroad, that the 
Earth fenfibly rofe up, and fo Tank down again ; 
but I much queftion the Truth of it ; for if there 
had been any fuch Succuftion to raiie the Earth to 
any confiderablc Height, the Houfes would certain- 
ly have tumbled down, or the the Exhalation forced 
its Way by fome Breach. Nor was our Motion of 
the Earth that which Ariftotle and ‘Pliny call a 
a Pulfe or an intermittent Knocking, but one con- 
tinued Shake or Trembling ; and therefore muft be 
ranked under the firft Species, viz. a Tremor or 
Shake, without altering the Pofition of the Earth, 
and left all things in the fame Poflure in which it 
found them, except the falling down of the Tops 
of fome Chimnies, Stone Walls, &c. without doors ; 
Dilhes and fome other Things within doors 5 which 
I fhall obferve when I come to Ipeak of the Degree 
of the Shake. 
That our Earthquake was of the firft Species is 
alfo proved from the Sound that accompanied it, 
fince tremulous and vibrating Motions are proper 
to produce Sounds which brings me to the third 
I 2 Par- 
