( 6t ) 
found. Being fuppos’d at firft to have the Velocity 
of the Surface of the Earth at the Equator, it will 
have a greater Velocity than the Parts it now arrives 
at ; and thereby become a wefterly Wind, with 
Strength proportionable to the Difference of Ve- 
locity, which in feveral Revolutions will be redu- 
ced to a certain Degree, as is faid before, of the 
Eafterly Winds, at the Equator : And thus the Air 
will continue to circulate, and gain and lofe Veloci- 
ty by Turns from the Surface of the Earth or Sea, 
as it approaches to, or recedes from the Equator. 
I do not think it neceflary to apply thefe Principles 
to folve the Phenomena of the Variations of thefe 
Winds at different Times of the Year, and different 
Parts of the Earth ; and to do it would draw this 
Paper into greater Length than I propofe. From 
what has been faid it follows : 
Firft, That without the AfTiftance of the diurnal 
Motion of the Barth, Navigation, efpecially Eafterly 
and Wefterly, would be very tedious, and to make 
the whole Circuit of the Earth perhaps impracti- 
cable. 
Secondly , That the N. E. and S, E. Winds within 
theTropicks muft be compenfated by as much N.W. 
and S. W. in other Parts, and generally all Winds 
from any one Quarter muft be compenfated by a 
contrary Wind lome where or other ; otherw T ife 
ibme Change muft be produced in the Motion of 
the .Earth round its Axis. 
VI L An 
