[520] Gaetano Rossi of Catanzaro. This was the libretto writer (1772-1855), and hence the imperfections of the work can better be condoned. De Morgan should have given a little more of the title: _Solusione esatta e regolare ... del ... problema della quadratura del circolo_. There was a second edition, London, 1805. [521] This identifies Rossi, for Josephine Grassini (1773-1850) was a well-known contralto, _prima donna_ at Napoleon's court opera. [522] William Spence (1783-1860) was an entomologist and economist of some standing, a fellow of the Royal Society, and one of the founders of the Entomological Society of London. The work here mentioned was a popular one, the first edition appearing in 1807, and four editions being justified in a single year. He also wrote _Agriculture the Source of Britain's Wealth_ (1808) and _Objections against the Corn Bill refuted_ (1815), besides a work in four volumes on entomology (1815-1826) in collaboration with William Kirby. [523] "That used to be so, but we have changed all that." [524] "Meet the coming disease." [525] George Douglas (or Douglass) was a Scotch writer. He got out an edition of the _Elements of Euclid_ in 1776, with an appendix on trigonometry and a set of tables. His work on _Mathematical Tables_ appeared in 1809, and his _Art of Drawing in Perspective, from mathematical principles_, in 1810. [526] See note 443, on page 197. [527] John Playfair (1748-1848) was professor of mathematics (1785) and natural philosophy (1805) at the University of Edinburgh. His _Elements of Geometry_ went through many editions. [528] "Tell Apella" was an expression current in classical Rome to indicate incredulity and to show the contempt in which the Jew was held. Horace says: _Credat Judaeus Apella_, "Let Apella the Jew believe it." Our "Tell it to the marines," is a similar phrase.