1. Belling, John (1924). “Homologous and Similar Chromosomes in Diploid and Triploid Hyacinths.”Journ. Gen. x. 60.
2. Blakeslee, A. F., Belling, John andFarnham, M. E. (1923). “Inheritance in Tetraploid Daturas.”Bot. Gaz. lxxvi.
3. Brieger, F. G. andMangelsdorf, A. J. (1926). “Linkage between a Flower Colour Factor and Self-sterility Factors.”Proc. Nat. Acad. Sci. xii. 248.
4. Buxton, B. H. andNewton, W. C. F. (1928). “Hybrids ofDigitalis ambigua andDigitalis purpurea, their Fertility and Cytology.”Journ. Gen. xix. 3.
5. Clausen, R. E. andGoodspeed, T. H. (1925). “Interspecific Hybridisation inNicotiana. II.”Ibid. Journ. Gen. x.