CONTENTS. 



Pbeface to Ebpeint of 1884 Page v 



Preface xiii 



Intboduotion , 1-13 



CHAPTEE I. 



Heterostyled Dimorphic Plants: Primulacea 



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 — Hottonla palustris — 

 Androsace Vitalliana 14-54 



CHAPTER II. 



Hybrid Primulas. 



The Oxlip a hybrid naturally produced between Primula veris and 

 vulgaris — The difiFerences in structure and fimction 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 Oxlips 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 — Supplementary note on spon- 

 taneously produced hybrids in the genus Verbascum . . 55-80 



