1. An account of “Colour and Constitution” is given in Enc. Brit. , 11th ed. 1901 vi 70 72 See also Smiles's ‘Chemical Constitution and Physical Properties,’ Longmans (1910), Chaps. X., XI.
2. See
W.H.
Bragg's W.L. X Rays and Orystal Structure Bell London 1915 106 106 admirable book on