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Rh by thee and everal other Arguments detroy'd the Carteian Vortices, he depair'd of ever being able to dicover, whether there is a ecret Principle in Nature which, at the ame Time, is the Caue of the Motion of all celetial Bodies, and that of Gravity on the Earth. But being retir'd in 1666, upon Account of the Plague, to a Solitude near Cambridge; as he was walking one Day in his Garden, and aw ome Fruits fall from a Tree, he fell into a profound Meditation on that Gravity, the Caue of which had o long been ought, but in vain, by all the Philoophers, whilt the Vulgar think there is nothing myterious in it. He aid to himelf, that from what height oever, in our Hemiphere, thoe Bodies might decend, their Fall wou'd certainly be in the Progreion dicover'd by Galileo; and the Spaces they run thro' would be as the Square of the Times. Why may not this Power which caues heavy Bodies to decend, and is the ame without any enible Dimi-