CONTENTS. vii 



fertile — Oxalis, transmission of form to the Intimate and il- 

 legitimate seedlings— Primula Sinensis, illegitimate offspring in 

 some degree dwarfed and infertile— Equal-styled varieties of P. 

 Sinensis, auricula, farinosa, and elatior — ^P. vulgaris, red-flowered 

 variety, illegitimate seedlings sterile — P. veris, illegitimate 

 plants raised during several successive generations, their dwarfed 

 stature and sterility — Equal-styled varieties of P. veris — Trans- 

 mission of form by Pulmonaria and Polygonum — Concluding 

 remarks — Close parallelism between illegitimate fertilisation and 

 hybridism Page 188-243 



CHAPTEE VI. 



CoNCLumNQ Eemabks on Heteeostyled Plants. 



Tl.e essential character of heterostyled plants — Summary of the 

 differences in fertility between legitimately and illegitimately 

 fertilised plants — ^Diameter of the pollen-grains, size of anthers 

 and structure of stigma inHhe different forms — AfSnities of the 

 genera which include heterostyled species — ^Nature of ths 

 advantages derived from heterostylism — The means by which 

 plants became heterostyled — Transmission of form — Equal- 

 styled varieties of heterostyled plants — Final remarks 244-277 



CHAPTEE VII. 



POLTGAMOTJS, DkEOIOTTS, AND GtNO-D1(E0I0TTS PlANTS. 



The conversion in various ways of hermaphrodite into dioecious 

 plants — ^Heterostyled plants rendered dioecious — ^Bubiacese — 

 Verbenaceae — ^Polygamous and sub-dioecious plants — Euonymus 

 — Fragaria — The two sub-forms of both sexes of Bhamnus and 

 Epigaea — ^Ilex — Gyno-dioecious plants — ^Thymus, difference in 

 fertility of the hermaphrodite and female individuals — Satureia 

 — ^Manner in which the two forms probably originated — Scabiosa 

 and other gyno-dioecious plants — Difference in the size of the 

 corolla in the forms of polygamous, dioecious, and gyno-dioecious 

 plants 278-309 



