71. Pfaff. Schweigger-Seidel, 1831, 1: 87.
72. Pfaff and Liebig. Ann. Pharm., 1832, 1: 17.
73. Pohl. Arch. Exper. Path. Pharm., Suppl. Bd., 1908, p. 427.
74. Pratt. Boston Med. Surg. J., 1868, 2: 82.
75. Robiquet. Dict. Tech., Paris, 1823, 4: 59.
76. Rost. Diss. Heidelberg, 1895.
77. Runge. Neuste phyto-chem. Entdeckungen, Breslau, 1820.
78. Salant. U. S. Dept. Agr., Bureau of Chemistry Cir. 81.
79. Schmiedeberg and Bunge. Arch. Exper. Path. Pharm., 1874, 2: 62.