CONTENTS. 



INTRODUCTION Page 1-13 



CHAPTER I. 



HETEROSTYLED DIMORPHIC PLANTS : PRIMULACEJE. 



Primula veris or the Cowslip Differences in structure between the 

 two forms Their degrees of fertility when legitimately and ille- 

 gitimately united P. elatior, vulgaris, Sinensis, auricula, &c. 

 Summary on rlie fertility of the heterostyled species of Primula 

 Homostyled species of Primula^ Hdttonia palustris Androsace 

 Vitalliana 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 Oxlips artificially 

 self-fertilised and cross-fertilised in a state of viture 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 Yerbasciim .. 55-80 



