88 Species Hybrids of Digitalis 



REFERENCES. 



Bateson. MendeVs Principles of Heredity. 



Badr. Einfiihrung in die experimentelle Vererbungslehre (1911). 



FocKE. Die PJlanzen-Mischlinge (1881). 



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



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



GoDRON. Ann. sc. nat. 4. ser. xix. 



KoELREUTER. Act. acod. Petrop. 1777, 1778. 



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



Fourth Int. Conf. of Genetics (1911). 



Journal of Genetics, i. 1911. 



DE Y^\¥&, Biol. Centr. xxxi. 1911, p. 97. 

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



EXPLANATION OF FIGURES. 



D.P. and D.G. are used throughout as abbreviations for D. purpurea and D. grandijlora. 

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



PLATE V. 



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. 



