IV.
CRUCIFERAE, PAPAVERACEAE, RESEDACEAE, ETC.
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.
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.
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.