[294] Bretschneider, Study of Chinese Botan. Works, 1870. 17.
[295] Morton’s Cycloped. of Agriculture, ii. (1855) 440.
[296] Journ. de Pharm. xvii. (1831) 279.
[297] An interesting object for the polarizing microscope.
[298] The red compound thus formed with sulphocyanide is readily soluble in ether, yet in the case of white mustard we find it not to be so.
[299] Experiments performed by Mr. Weppen in my laboratory, 1869.—F. A. F.
[300] Gmelin, Chemistry, xiv. (1860) 521 and 529.
[301] Ibid. 521.
[302] Pflanzenwelt Norwegens (1873) 296.
[303] Lib. xix. c. 26 (Littré’s translation).