1. K. Butkow and W. Tschassowenny,Acta Physicochimica U. R. S. S., 1936,5, 137, 645.
2. M. I. Haq and R. Samuel,Nature, March 21st, 1936;Proc. Ind. Acad. Sci., Bangalore, 1936,3, 487.
3. H. Lessheim and R. Samuel,Proc. Ind. Acad. Sci., Bangalore, 1935,1, 623 (sect. XIII); R. F. Hunter and R. Samuel,Chem. and Ind., 1936,55, 733.
4. cf. e.g., N. V. Sidgwick,The Electronic Theory of Valency, London, 1927; Contributions toAnnual Reports Chem. Soc., London; S. Sugden,The Parachor and Valency, London, 1930.
5. R. K. Asundi and R. Samuel,Proc. Phys. Soc., London, 1936,48, 28; M. Jan-Khan and R. Samuel,ibid., Proc. Phys. Soc., London, 1936,48, 626; Y. P. Parti and R. Samuel,ibid., Proc. Phys. Soc., London, 1937,49, 568; S. L. Hussain and R. Samuel,ibid. Proc. Phys. Soc., London, (in Press);cf. Curr. Sci., 1936,4, 734.