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 species 

 Hybrids between other heterostyled species of Primula Sup- 

 plementary note on spontaneously produced hybrids in the 

 genus Yerbascurn 55-80 



