Her uncle was also fond of her; an excerpt of an uncharacteristically warm letter from Newton survives, regarding her contraction of smallpox: "Pray let me know by your next how your face is and if your fevour be going. Perhaps warm milk from ye Cow may help to abate it. I am Your loving Unkle, Is. Newton." Sometime after her uncle Newton moved to London to become Warden of the Mint in April 1696 she moved there to live with him. Barton was said to have been the source of the story about Newton and the apple, as she told the story to Voltaire who later wrote about it in his "Essay on Epic Poetry" of 1727.