Volume I 



MARCH, 1911 



No. 2 



EXPERIMENTS WITH PRIMULA SINENSIS. 



By R. p. GREGORY, M.A., 

 Fellow of St John's College, Cambridge ; University Lecturer in Botany. 



ivoiNvxon 



NaOA M3M 



Aavaan 



CONTENTS. 



Page 



Intkoduciion 74 



Heteeosiylism "^^ 



Abnormal cases 84 



Leaf-Shape 86 



Palmate and Fern-leaf . 87 



Ivy-leaf 87 



Habit 88 



Double Flowees 89 



Inheritance of ordinary double 91 



Chaeactees of the "Eye" of the Flowee .... 91 



Large yellow eye x small eye ...... 92 



White eye x small yellow eye 94 



White eye x large yellow eye 94 



CoLOTJK 94 



A. Stem-Coloues 9-5 



Inheritance of Stem-colours 96 



Partial Suppression of Colour 100 



B. Flowee-Coloues 101 



Inheritance of Flower-colours 103 



Partial Suppression of Colour 10.5 



Inhibition 10.5 



Experimental results : (1) Pale colours . . . 108 



(2) Full colours . . .109 



(3) Inhibition . . .115 



(4) Flakes .... 121 



Gametic Codpling and Repulsion 124 



Description of Plates 130 



Journ. of Gen. i 



