Mifcellanea Curiofa. 79 



the North- Eaft Trade- Wind below, will be at- 

 tended with a South- Wefterly above, and the 

 South-Eafterly with a North- Weft Wind above; 

 that this is more than a bare Conjecture, the al- 

 moft inftantaneous Change of the Wind to the 

 oppofite Point, which is frequently found in paf- 

 fing the limits of the Trade-winds, feems to af- 

 iure us \ but that which above all confirms this 

 Hypothefis is the Phenomenon of the Monfoons, by 

 this means moft eafily folved, and without it hard- 

 ly explicable. 



Suppofing therefore fuch a Circulation, as a- 

 bove, 'tis to be confidered that to the Northward 

 of the Indian Ocean there is every where Land 

 within the ufual limit of the Latitude of 30, yifc 

 Arabia** Perjia, lndia % &c. which for the fame 

 reafbn as the Mediterranean Parts of Africa, are 

 fubjecl: to unfufferable Heats when the Sun is to 

 the North, paffing nearly Vertical; but yet 

 are temperate enough when the Sun is re- 

 moved towards the other Tropick, ; becaule of a 

 ridge of Mountains at Jo me diftance within the 

 Land, faid to be frequently in Winter cover'd 

 with Snow, over which the Air, as it paffes, 

 muft needs be much chill'd. Hence it comes to 

 pafs, that the Air coming according to the ge- 

 neral Rule, out of the N. E. in the Indian Seas, 

 is fometimes hotter, fometimes colder, than that 

 which by this Circulation is return'd out of the 

 S. W. and by confequence, fometimes the under 

 Current or Wind, is from the N. E. fometimes 

 from the S. W. 



That this has no other Caufe, is clear from the.. 

 times wherein thefe Winds fet in, vi%. in Afril 9 

 when the Sun begins to warm thofe Countries 

 to ,.jthe North, the S. W. Monfaon begin?, and 

 blows during the Heats till Ocloher ; when the 



Sun 



