[ I 007] 
perigseum of the other: feem to me to be of much grea- 
ter confideratioii, not only as to the Ebbing and Flowing 
of the ^^^, (which I take to depend principally thereon, 
but to bevarioudy modified alfo by the various pofitions 
of the continent on which it beats J but as to the Winds 
alfo: efpecially the briezes and Trade-Winds; which at 
certain times of the day, oroftheyear, or of the month, 
are obferved to blow conftantly('or moft frequently Jfrom 
luch or Inch a Coaft. 
And I am not fure, that the body of Earth and Water 
(or Terraqueous Globe,) is exadly fpherical('aIlov/ing onely 
for the fraall inequalities of Hills and Dales, which in a 
body of that greatnefs, are inconfiderable,) but may have 
fomewhat of an oblong fpheroeid, having a longer jixii 
from Pole to Pole, then at the Equator. And though 
this cannot be much; becaufe of the Earths fliadow in 
the Moons Ecliple appearing circular, and the defcent 
of heavy bodys being always (as to fenfe,) in a perpendi- 
cular to the Hori'^on : yet, if it be but little, this ^with the 
compound motions before mentioned,) will give the Air 
aconfiderable difturbance. 
To which I may add alio, that we arc not fure, that 
the Seas and continents ('which are of very different com- 
parative weights, Earth being heavyer then Water, j are 
io adequately adjufted the one to the other, as that its 
center of gravity (^by which a plain pafling divides it into 
parts ^equiponderant, j is the fame with its center of Mag- 
nitude (by which it is divided into parts equally great,) 
which if it happen to be otherwife, will ^with the reft,) 
make the confufions of the Jirs motions yet greater. 
From the comparative weight or lightnefs of the ^ir at 
different times, he deduceth alfo the rifing or falling of - 
Vapours in it. As if, when fuch Fumes or Vapours, c«: 
other the like matters, are lighter then the Aivy they 
ought (according to the exad rules of HydroftaticksJ to 
afcend therein; but, when heavyer then fo, to fall 
D d dowii. 
