. -1) Trimble, Contrib. Botan. Laborat. Univers. Pennsylvan. 1 (1892), p. 50. 2) ßolley, Journ. f. prakt. Chemie 93 (1864), p. 361. 3) M. Krieger, Neu Guinea, p. 72. 4) W. Eitner, Der Gerber. 1902, XXVIII. Jahrg., p. 262.

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