CONTENTS. 



Introduction Page 1-13 



CHAPTEE I. 



Hetebostyled Dimoephic Plants : Pbimulaceje. 



Primtila 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. — 

 Summaiy on the fertility of the heterostyled species of Primula — 

 Homostyled species of Primula — Hottonia palustris — ^Androsace 

 Vitalliana 14-54 



CHAPTEE IL 



Htbbid Pbimulas. 



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 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 Verbasoum .. 55-80 



