88 Species Hj/hricU of Digitalis 



REFERENCES. 



Batesox. JfeiidePs Principles of Heredity. 



Badr. Einfiihrunij in die experiinentelle Vererhungslehre (1911). 



FocKE. Die Pflanzen-Miscfilinge (1881). 



Gartner. Flor (B. Z.) (1833). 



Geerts. Recueil Trav. Bot. Ncerlandais, v. p. 93 (1909). 



GoDRON. Ann. sc. nat. 4. sdr. xix. 



KoELREDTER. Act. acad. Petrop. 1777, 1778. 



Saunders. Report to Evol. Comm. of Royal 8oc. iv. (1908). 



. Fourth Int. Conf of Genetics (1911). 



Journal of Genetics, I. 1911. 



DE Vries, £iW. Ceiitr. xxxi. 1911, p. 97. 

 Wilson. Third Int. Conf. of Genetics (1906). 



EXPLANATION OF FIGURES. 



J). p. and D.G. are used throughout as abbreviations {or D.pyirpurea and D. prandiflora. 

 All illustrations are either photographs or drawn to scale with camera luoida. 



8. Underside of leaf of D.P. 



9. „ „ D.G. 



10. ,, ,, (D.P.xD.G.). 



11. „ ,, (D.G.xD.P.). 

 The scale by fig. 11 marks centimetres. 



