wards and Southwards, being lefs rarified than that in the 
middle, it follows, that from both fides it ought to tend to- 
wards the Equator : This Motion compounded with the 
former Eafterly Wind anfwers all the Ph^inomenx of the ge- 
neral Trade Winds, v/hich if the whole furface of the Globe 
were Sea, would undoubtedly blovv all round the World, as 
they are found to do in the AtUntick and JLthiofick 
Oceans, 
But feeing that fb greit Continents do interpofe and 
break the continuity of the Oceans,regard muft be had to the 
Nature of the Soil, and the pofition of the high Mountains, 
which I fuppofe the two principal Caufcs of the feveral Va- 
riations of the Winds, from the former general Rule; for if a 
Country lying near the Sun , prove to be flat, fandy, low 
Land, fuch as the Defartsof Lyl/iadiXt ufually reported to be, 
the heat occafioned by the reflection of the Suns Beams, and 
the retention there of in the Sand ,is incredible to thofe that 
have not felt it ; whereby the Air being exceedingly rarifi- 
ed, it is neceflary that this cooler and more denfe Air rhould 
run thitherwards to reiiore the Mqtiilibrium : This I take to 
be the caufe, why near the Coafl: of Guine/i the Wind al- 
ways fets in upon the Land , blowing Weilerly nftead of 
Eafterly, there being fiifficient reafon to beheve, tiiat trie In- 
land Parts of Africa are prodigioufly hot, fince the N^ordiern 
borders thereof were fb intemperate, as to give the Ancients 
caufe to conclude, that all beyond the Tmick was made in- 
habitable by excefs of heat : From the fame caufe it hap- 
pens, that there are fb conllant Calms in that part of tiie 
Ocean, called the Raines, (defcribed in the ^th. Remark on 
the Atlamck Seaj for this Trad being placed in the middle, 
between the Wefterly Winds blowing on the Coafl: Guinea, 
and the Eafl:erly Trade-Winds, blowing to the Weltwards 
thereof, the tendency of the Air here, is indiiferent to either, 
and fo ftands in jE^ciuililrio between both ; and the weight 
of the incumbent Atmofphere being diminifhed by the con- 
tihual contrary Winds blowing /r^'^?^ hence, is the reafon 
