CONTENTS. XXIU 



fertile — Oxalie, transmission of fonn to the legitimate and 

 illegitimate seedlings — Primula Sinensis, illegitimate offspring 

 in some degree dwarfed and infertile — Equal-styled varieties of 

 1'. Sinensis, auricula, farinosa, and elatior — P. vulgaris, red- 

 flowered variety, illegitimate seedlings sterile — P. veris, illegi- 

 timate plants raised during several successive generations, their 

 dwarfed stature and sterility — Equal- styled varieties of P. 

 veris — Transmission of form by Pulmonaria and Polygonum — 

 Concluding remarks — Close parallelism between iUegititnate 

 fertilisation and hybridism Page 188-243 



CHAPTEE VI. 



Concluding Eemaeks on Hetekostyled Plants. 



The essential character of heterostyled plants — Summary of the 

 differences In fertility between legitimately and illegitimately 

 fertilised plants — Diameter of the poUen-grains, size of anthers 

 and strnoture of stigma in the different forms — Affinities of the 

 genera which include heterostyled species — Nature of the 

 advantages derived from heterostyHsm — The means by which 

 plants become heterostyled — Transmission of form — Equal- 

 styled varieties of heterostyled plants — Final remarks 244-277 



CHAPTEE VII. 



Polygamous, Dkeoious, and Gtno-dhecious Plants. 



The conversion in various ways of hermaphrodite into dioecious 

 plants — Heterostyled plants rendered dioecious — EubiacEe — 

 VerbenacesB — Polygamous and sub-dioecious plants — ^Euonymus 

 — Fragaria — The two sub -forms of both sexes of Ehamnus 

 and Epigsea — Ilex — Gyno-dioecious plants — Thymus, difference 

 in fertility of the hermaphrodite and female individuals — 

 Satureia — Manner in which the two forms probably originated — 

 Soabiosa and other gyno-dioeoions plants — Difference in the size 

 of the corolla in the forii.s of polygamous, dioecious, and gyno- 

 dioeoious plants 278-309 



