1. see Hunter and Samuel, J. Chem. Soc., 1180 (1934); Lessheim and Samuel, Proc. Ind. Acad. Sci. (Bangalore), 1, 623 (1935), and the literature mentioned in these papers.
2. Lessheim and Samuel, Phil. Mag., 21, 41 (1936); Asundi and Samuel, Proc. Phys. Soc., 48, 27 (1936); Proc. Ind. Acad. Sci. (Bangalore), 2, 30 (1935); 3, 466 (1936); Asundi, Jan Khan, and Samuel, Proc. Roy. Soc., in press, and literature mentioned there.
3. Hunter and Samuel, Chem. and Ind., 54, 31, 467, 635. (1935); Rec. trav. chim., 54, 114 (1935), and literature mentioned there.
4. J. Chem. Soc., 1709 (1935).
5. cf. Stuart, ” Molekülstruktur,” p. 114 (1934).