[74] Dingler, “Polyt. Journal,” 1871, Vol. CCI. p. 52.
[75] v. E. v. Bibra, “Ueber alte Eisen- u. Silberfunde,” p. 74.
[76] Morgan, “Fouilles à Dahchour,” p. 135.
[77] “Verhandl. d. Berl. anthropol. Ges.,” 1897, p. 348.
[78] Krause, “Verhandl. d. Berl. anthropol. Ges.,” 1883, p. 360.
[79] Muspratt’s “Chemistry,” Vol. III. p. 1389.
[80] “Verhandl. d. Berl. anthropol. Ges.,” 1889, pp. 243 and 244.
[81] Id. 1892, p. 449.
[82] Id. 1897, p. 347.
[83] At that time obtained from the Stralau waterworks.