M. Nencki and F. Schaffer. N. Sieher: Jour. Pract. Chem., 23, 412.

[11]

E. Klein: Quar. Jour. Micros. Science, 1875, 381. O. Helm: Arch. Pharm., 1875, 19-24. G. Gugini: Gaz. Chem., 7, 4. W. Thorner: Bul. Ber, xi, 533.

[12]

Handbook of Dyeing. By W. Crookes, London, 1874. p. 367. Schunck: Ann. Chem. Pharm., 41, 157; 54, 261; 61, 72; 61, 64; 61, 78. Rochelder and Heldt, ibid., 48, 2; 48, 9. Stenhouse, ibid., 68, 57; 68, 72; 68, 97, 104; 125, 353. See also researches of Strecker, O. Hesse, Reymann, Liebermann, Lamparter, Knop, and Schnedermann.

[13]

Stahlschmidt.

[14]

E. Treffner: Inaugur. Diss. Dorpat, 1880.

[15]