REFERENCES.--Galileo’s Biography in “Engl. Cycl.,” Vol. III. pp. 13–17; Miller, “Hist. Phil. Illust.,” London, 1849, Vol. III. p. 203, note; Nelli, “Vita,” 1793; Libri, “Hist. des Sc. Math.,” Paris, 1838, Vol. IV. pp. 157–294, 473–484; Houzeau et Lancaster, “Bibliog. Générale,” Vol. I. part i. pp. 655–657 for an analyzation of the works of Galileo, also Vol. II. pp. 137–145, 1576–1578; Wm. Whewell, “Phil. of the Ind. Sc.,” London, 1840, Vol. II. pp. 379–383; Guillaume Libri, “Histoire des Sc. Math.,” Halle, 1865, Vol. IV. pp. 157–302, and the notes; “Journal des Savants” for September and October 1840, for March and April 1841, for July to November 1858, for September 1868 and for October 1877; “Geschichte der Mathem.,” Vol. IV. pp. 4, 173, etc.; Larousse, “Dict.,” Vol. VIII. p. 954; “La Grande Encycl.,” Vol. XVIII. pp. 383–385; “Biog. Gén.,” Vol. XI. pp. 252–267; Fabroni (A.), “Vitæ Italorum,” 1778–1805, also “Elogi d’Illustri Italiani,” 1786–1789; likewise the very numerous entries concerning Galileo’s history, his Opponents, Supporters and School, which appear at pp. 331–357, Part I. of Libri’s “Catalogue,” published in 1861. Consult also “Galileo,” by Ed. S. Holden, in the “Popular Sc. Monthly” for January, February, May and June 1905; “Bibliot. Brit.,” Vol. XVI. N.S., 1821, pp. 3–21, 79–100, for an account of the life of Galileo by M. G. B. Clément de Nelli; “Journal des Sçavans,” Vol. LXX. for 1721, p. 350 in his “Saggiotore”; “Imperial Dictionary of Universal Biography,” published by Wm. McKenzie, London, pp. 536–539, giving an account of Galileo’s other discoveries. =A.D. 1635.=--Delambre (J. B. J.) (1749–1822), professor of astronomy at the Royal College of France, refers (Vol. II. p. 545 of his “Histoire de l’Astronomie Ancienne,” 1817) to the mention made in “Procli Diadochi Paraphrasis Ptolem.,” lib. iv. “de siderum effectionibus,” 1635, p. 20, of the notion long current, especially along the shores of the Mediterranean, “that if a magnetic rod be rubbed with an onion, or brought into contact with the emanations of the plant, the directive force will be diminished, while a compass thus treated would mislead the steersman.” REFERENCES.--Humboldt, “Cosmos,” 1859, Vol. V. p. 156, also the entry at A.D. 1653. See likewise Whewell, “Hist. of the Ind. Sc.,” Vol. I. pp. 442, 443, 447, and the biography in the Supplement of the “English Cyclopædia,” pp. 539–541; “Journal des Savants,” for April 1828. =A.D. 1635.=--Gellibrand (Henry), prominent English mathematician, professor of geometry and the successor of Edmund Gunter (A.D. 1624), in the chair of astronomy at Gresham College, publishes his discovery of the _secular variation of the declination_. The credit of this discovery has been by many given to John Mair. The _diurnal and horary variation_ was found by Graham in 1722, and the _annual variation_ was discovered by Cassini, 1782–1791.