[25] _Messungen über d. Kerr'sche Erscheinung._ Inaugural Dissert. Leiden, 1893. [26] _Phil. Mag._ [5] 5, p. 161. [27] _Phil. Mag._ [3] 28, p. 469. [28] _Die Magn. Drehung d. Polarisationsebene des Lichts_, Halle, 1863. [29] _Electricity and Magnetism_, chap. xxi. [30] _Phil. Trans._ 1880 (2), p. 691. [31] _Phil. Mag._ (5) 11, p. 254, 1881. [32] _Arch. Néerl._ 19, p. 123. [33] _Wied. Ann._ 23, p. 493; 67, p. 345. [34] _Wied. Ann._ 24, p. 119. [35] _Wied. Beiblätter_, 8, p. 869. [36] _Comptes rendus_, 108, p. 510. [37] _Phil. Trans._ 182, A. p. 371, 1892; _Physical Optics_, p. 393. [38] _Wied. Ann._ 46, p. 71; 47, p. 345; 48, p. 740; 50, p. 722. [39] _Wied. Ann._ 46, p. 353; 48, p. 122; 49, p. 690. [40] _Recent Researches_, p. 489 et seq. [41] _Phil. Trans._, A. 1897, p. 89. [42] _Brit. Assoc. Report_, 1893. [43] _Comptes rendus_, 127, p. 548. [44] _Bull. de l'Acad. des Sciences Belg._ (3) 9, pp. 327, 381, 1885; 12 p. 30, 1886. [45] _Communications from the Physical Laboratory_, Leiden, No. 33, 1896; Phil. Mag. 43, p. 226; 44, pp. 55 and 255; and 45, p. 197. [46] _Arch. Néerl._ 25, p. 190. [47] _Phil. Mag._ 45, p. 325; 47, p. 165. [48] _Comptes rendus_, 126, p. 181. [49] _Phil. Mag._ 46, p. 187. [50] _Phil. Mag._ 45, p. 348. [51] _Comptes rendus_, 125, p. 865. [52] _Comptes rendus_, pp. 748 and 949, 1897. [53] _Comptes rendus_, 127, p. 216; 128, p. 45. (J. J. T.) MAGNOLIA, the typical genus of the botanical order Magnoliaceae, named after Pierre Magnol (1638-1715), professor of medicine and botany at Montpellier. It contains about twenty species, distributed in Japan, China and the Himalayas, as well as in North America.