Calista. In N. Rowe’s The Fair Penitent (1703).
The Mourning Bride. Congreve’s tragedy (1697).
When I first came from Bath. Mrs. Siddons was a member of the Cheltenham Company when she was recommended to the notice of Garrick, and then obtained an engagement at Drury Lane (1775).
Lord Byron says. See Medwin, Conversations of Lord Byron, 1824 (p. 106).
Sir Isaac Newton was not twenty. He seems to have been twenty-four. See Voltaire’s Lettres sur les Anglais.
Harvey ... at eighteen. The first lectures in which he set forth his views were delivered in 1616, in his 38th year.
Berkeley ... Essay on Vision. Bishop Berkeley’s Essay towards a New Theory of Vision was published in 1709. He was born in 1685.
Hartley’s great principle. David Hartley’s (1705–1757) great work, Observations on Man (1749), was begun when he was about twenty-five.
Hume ... Treatise on Human Nature. David Hume’s (1711–1776) Treatise was published in 1739.
Galileo. Galileo Galilei (1564–1642) was appointed mathematical professor at Pisa when he was twenty-four.