loose and fluid Particles of the Air, being so exceeding light as they be, are left behind, so that in respect of the Earths Surface they move Westwards, and become a constant Easterly Wind. This Opinion seems confirm'd, for that these Winds are found only near the Æquinoctial , in those Parallels of Latitude where the diurnal Motion is swiftest; and I should readily assent to it, if the constant Calms in the Atlantick Sea, near the Æquator , the Westerly Winds near the Coast of Guinea ; and the Periodical Westerly Monsoons under the Æquator in the Indian Seas, did not declare the insufficency of that Hypothesis . Besides the Air being kept to the Earth by the Principle of Gravity , would acquire the same degree of Velocity that the Earths Surface moves with, as well in respect of the diurnal Rotation , as of the Annual about the Sun, which is about thirty times swifter.
It remains therefore to substitute some other Cause, capable of producing a