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Newton and the Apple
The story that Newton's hypothesis of universal gravitation was prompted by the fall of an apple, is probably based on fact. There are several reliable accounts from the last few years of his life which record him describing such an event. (There is no indication an apple fell on his head though...)
The first was recorded by William Stukeley, who said that after dining with Newton in Kensington on 15 April 1726:
John Conduitt recorded a similar story:
There are also two versions published by Voltaire in the eighteenth century. In the Essay on the Civil War in France(1727) he stated that Sir Isaac Newton walking in his Garden had the first thought of his System of Gravitation, upon seeing an Apple failing down from the Tree. In the Letters Concerning the English Nation(1733) he referred instead to a fruit falling from a tree and that he had this story from Newton's niece, Catherine Barton who was also Conduitt's wife. It should be remembered that Voltaire was in London for the last year of Newton's life and for two years after and met several of his friends - although he got no closer to Newton than his funeral.
The story is also repeated by Robert Greene in his Principles of the Philosophy of the Expansive and Contractive Forces(1727, p972) who cites Martin Folkes, the vice-president of the Royal Society.
The tree shown to inquisitive visitors to Woolsthorpe Manor in the eighteenth century no longer survives. However, various saplings grow in Newtonian sites around the world, including the Babson College Library and on the lawn to the right of Great Gate of Trinity College Cambridge, in the garden Newton once owned.
Both the saplings and the apple trees currently growing at Woolsthorpe are of the species Flower of Kent, a pear-shaped cooking variety.
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