[4] Wied. Ann. 23, p. 228; 27, p. 191.

[5] Wied. Ann. 31, p. 941.

[6] Phil. Trans., A. 1885, Pt. 11, p. 343.

[7] Wied. Ann. 26, p. 456.

[8] Phil. Trans., A. 1895, Pt. 17, p. 621.

[9] Wied. Ann. 24, p. 161.

[10] Wied. Ann. 31, p. 970.

[11] Comptes rendus, 57, p. 670.

[12] Comptes rendus, 43, p. 529; 44, p. 1209.

[13] Journ. Chem. Soc. 1884, p. 421; 1886, p. 177; 1887, pp. 362 and 808; 1888, p. 561; 1889, pp. 680 and 750; 1891, p. 981; 1892, p. 800; 1893, pp. 75, 99 and 488.