CONTENTS 



Preface to Reprint of 1884 . • . . . Page v 



Preface xiii 



Introduction 1-13 



CHAPTER I. 



Heterostyled Dimorphic Plants : Primulace^e. 



Primula veris or the Cowslip — Differences in structure between the 

 two forms — Their degrees of fertility when legitimately and 

 illegitimately united — P. elatior, vulgaris, Sinensis, auricula, 

 &c. — Summary on the fertility of the heterostyled species of 

 Primula — Homostyled species of Primula — Hottonia palustris 

 — Androsace Vitalliana ...... Page 14-54 



CHAPTER II. 



Hybrid Primulas. 



The Oxlip a hybrid naturally produced between Primula veris and 

 vulgaris — The differences in structure and function between 

 the two parent-species — Effects of crossing long-styled and 

 short-styled Oxlips with one another and with the two forms 

 of both parent-species — Character of the offspring from Ox- 

 lips artificially self-fertilised and cross-fertilised in a state of 

 nature — Primula elatior shown to be a distinct specie; 

 Hybrids between other heterostyled species of Primula — Sup- 

 plementary note on spontaneously produced hybrids in the 

 genus Verbascum ........ 55-80 



xxi 



i 



