Brassica oleracea, crossed and self-fertilised plants.--Great effect of a cross with a fresh stock on the weight of the offspring.--Iberis umbellata.--Papaver vagum.--Eschscholtzia californica, seedlings from a cross with a fresh stock not more vigorous, but more fertile than the self-fertilised seedlings.--Reseda lutea and odorata, many individuals sterile with their own pollen.--Viola tricolor, wonderful effects of a cross.--Adonis aestivalis.--Delphinium consolida.--Viscaria oculata, crossed plants hardly taller, but more fertile than the self-fertilised.--Dianthus caryophyllus, crossed and self-fertilised plants compared for four generations.--Great effects of a cross with a fresh stock.--Uniform colour of the flowers on the self-fertilised plants.--Hibiscus africanus. CHAPTER V. GERANIACEAE, LEGUMINOSAE, ONAGRACEAE, ETC. Pelargonium zonale, a cross between plants propagated by cuttings does no good.--Tropaeolum minus.--Limnanthes douglasii.--Lupinus luteus and pilosus.--Phaseolus multiflorus and vulgaris.--Lathyrus odoratus, varieties of, never naturally intercross in England.--Pisum sativum, varieties of, rarely intercross, but a cross between them highly beneficial.--Sarothamnus scoparius, wonderful effects of a cross.--Ononis minutissima, cleistogene flowers of.--Summary on the Leguminosae.--Clarkia elegans.--Bartonia aurea.--Passiflora gracilis.--Apium petroselinum.--Scabiosa atropurpurea.--Lactuca sativa.--Specularia speculum.--Lobelia ramosa, advantages of a cross during two generations.--Lobelia fulgens.--Nemophila insignis, great advantages of a cross.--Borago officinalis.--Nolana prostrata. CHAPTER VI. SOLANACEAE, PRIMULACEAE, POLYGONEAE, ETC. Petunia violacea, crossed and self-fertilised plants compared for four generations.--Effects of a cross with a fresh stock.--Uniform colour of the flowers on the self-fertilised plants of the fourth generation.--Nicotiana tabacum, crossed and self-fertilised plants of equal height.--Great effects of a cross with a distinct sub-variety on the height, but not on the fertility, of the offspring.--Cyclamen persicum, crossed seedlings greatly superior to the self-fertilised.--Anagallis collina.--Primula veris.--Equal-styled variety of Primula veris, fertility of, greatly increased by a cross with a fresh stock.--Fagopyrum esculentum.--Beta vulgaris.--Canna warscewiczi, crossed and self-fertilised plants of equal height.--Zea mays.--Phalaris canariensis. CHAPTER VII. SUMMARY OF THE HEIGHTS AND WEIGHTS OF THE CROSSED AND SELF-FERTILISED PLANTS.