[562] For there is a well-known series 1 + 1/2^2 + 1/3^2 + ... = [pi]^2/6. If, therefore, the given series equals 1, we have 2 = 1/6 [pi]^2 or [pi]^2 = 12, whence [pi] = 2 [root]3. But c = [pi]d, and twice the diagonal of a cube on the diameter is 2d [root]3. [563] There was a second edition in 1821. [564] London, 1830. [565] He was a resident of Chatham, and seems to have published no other works. [566] Richard Whately (1787-1863) was, as a child, a calculating prodigy (see note 132, page 86), but lost the power as is usually the case with well-balanced minds. He was a fellow of Oriel College, Oxford, and in 1825 became principal of St. Alban Hall. He was a friend of Newman, Keble, and others who were interested in the religious questions of the day. He became archbishop of Dublin in 1831. He was for a long time known to students through his _Logic_ (1826) and _Rhetoric_ (1828). [567] William King, D.C.L. (1663-1712), student at Christ Church, Oxford, and celebrated as a wit and scholar. His _Dialogues of the Dead_ (1699) is a satirical attack on Bentley. [568] Thomas Ebrington (1760-1835) was a fellow of Trinity College, Dublin, and taught divinity, mathematics, and natural philosophy there. He became provost of the college in 1811, bishop of Limerick in 1820, and bishop of Leighlin and Ferns in 1822. His edition of Euclid was reprinted a dozen times. The _Reply to John Search's Considerations on the Law of Libel_ appeared at Dublin in 1834. [569] Joseph Blanco White (1775-1841) was the son of an Irishman living in Spain. He was born at Seville and studied for orders there, being ordained priest in 1800. He lost his faith in the Roman Catholic Church, and gave up the ministry, escaping to England at the time of the French invasion. At London he edited _Espanol_, a patriotic journal extensively circulated in Spain, and for this service he was pensioned after the expulsion of the French. He then studied at Oriel College, Oxford, and became intimate with men like Whately, Newman, and Keble. In 1835 he became a Unitarian. Among his theological writings is his _Evidences against Catholicism_ (1825). The "rejoinder" to which De Morgan refers consisted of two letters: _The law of anti-religious Libel reconsidered_ (Dublin, 1834) and _An Answer to some Friendly Remarks on "The Law of Anti-Religious Libel Reconsidered"_ (Dublin, 1834). [570] The work was translated from the French. [571] J. Hoene Wronski (1778-1853) served, while yet a mere boy, as an artillery officer in Kosciusko's army (1791-1794). He was imprisoned after the battle of Maciejowice. He afterwards lived in Germany, and (after 1810) in Paris. For the bibliography of his works see S. Dickstein's article in the _Bibliotheca Mathematica_, vol. VI (2), page 48. [572] Perhaps referring to his _Introduction a la philosophie des mathematiques_ (1811). [573] Read "equation of the."