COKTICXTS. Vll 



fertile — Oxalis, transmission of form to the legitimate 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 foiin by Pulmonaria and Polygonum — Concluding 

 remarks — Close parallelism between illegitimate fertilisation and 

 hybridism Page 188-243 



CHAPTER VI. 



COKCLUDINQ EbMAEKS ON HeTEROSTTLED PlaXTS. 



TI.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 in the different forms — Affinities of the 

 genera which include heterostyled species — Nature of the 

 advantages derived from heferostylism — The means by which 

 plants became heterostyled — Transmission of form — Equal- 

 styled varieties of heterostyled plants — Final remarks 244-277 



CHAPTER VII. 



Polygamous, Diceoious, and Gyno-dhecioits Plants. 



The conversion in various ways of hermaphrodite into dioecious 

 plants — Heterostyled plants rendered diceoious — Eubiacese — 

 Verbenaoeee — Polygamous and sub-dioecious plants — Euonymus 

 — Pragaria — The two sub-forms of both sexes of Ehamnus and 

 Epigasa — 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 



