Polyanthus, prepotency over cowslip.
Polygoneae.
Posoqueria fragrans.
Potato.
Poterium sanguisorba.
Potts, heads of Anthornis melanura covered with pollen.
Primrose, Chinese.
Primula elatior. -- grandiflora. -- mollis. -- officinalis. -- scotica. -- sinensis. measurements. early flowering of crossed. -- veris (var. officinalis). measurements. result of experiments. early flowering of crossed. seeds. self-fertility. prepotency of dark red polyanthus.
Primulaceae.
Pringlea.
Proteaceae of Australia.
Prunus avium. -- laurocerasus.
Pteris aquilina.
Radish.
Ranunculaceae.
Ranunculus acris.
Raphanus sativus.
Reinke, nectar-secreting glands of Prunus avium.
Reseda lutea. measurements. result of experiments. self-fertile. -- odorata. measurements. self-fertilised scarcely exceeded by crossed. seeds. want of correspondence between seeds and vigour of offspring. result of experiments. sterile and self-fertile.
Resedaceae.
Rheum rhaponticum.
Rhexia glandulosa.
Rhododendron, spontaneous crossing.
Rhododendron azaloides.
Rhubarb.
Ribes aureum.
Riley, Mr., pollen carried by wind. Yucca moth.
Rodgers, Mr., secretion of nectar in Vanilla.
Rye, experiment on pollen of.
Salvia coccinea. measurements. early flowering of crossed. seeds. partially self-sterile. -- glutinosa. -- grahami. -- tenori.
Sarothamnus scoparius. measurements. superiority of crossed seedlings. seeds. self-sterile.
Scabiosa atro-purpurea. measurements.
Scarlet-runner.
Scott, J., Papaver somniferum. sterility of Verbascum. Oncidium and Maxillaria. on Primula scotica and Cortusa matthioli.
Scrophulariaceae.
Self-sterile varieties, appearance of.
Self-fertilisation, mechanical structure to check.
Self-sterile plants. wide distribution throughout the vegetable kingdom. difference in plants. cause of self-sterility. affected by changed conditions. necessity of differentiation in the sexual elements.
Senecio cruentus. -- heritieri. -- maderensis -- populifolius. -- tussilaginis.
Sharpe, Messrs., precautions against intercrossing.
Snow-flake.
Solanaceae.
Solanum tuberosum.
Specularia perfoliata. -- speculum. measurements. crossed and self-fertilised. early flowering of crossed. seeds. self-fertile.
Spencer, Herbert, chemical affinity.
Spiranthes autumnalis.
Sprengel, C.K., fertilisation of flowers by insects. Viola tricolor. colours in flowers attract and guide insects. on Aristolochia. Aconitum napellus. importance of insects in fertilising flowers.
Stachys coccinea.
Stellaria media.
Strachey, General, perforated flowers in the Himalaya.
Strawberry.
Strelitzia fertilised by the Nectarinideae.
Structure of plants adapted to cross and self-fertilisation.
Swale, Mr., garden lupine not visited by bees in New Zealand.
Sweet-pea.
Tabernaemontana echinata.
Tables of measurements of heights, weights, and fertility of plants.
Termites, imperfectly developed males and females.
Thunbergia alata.
Thyme.
Tinzmann, on Solanum tuberosum.
Tobacco.
Transmission of the good effects of a cross to later generations.
Trees, separated sexes.
Trifolium arvense. -- incarnatum. -- minus. -- pratense. -- procumbens. -- repens.
Tropaeolum minus. measurements. early flowering of crossed. seeds. -- tricolor. seeds.
Tulips.
Typha.
Umbelliferae.
Urban, Ig., fertilisation of Medicago lupulina.
Vandellia nummularifolia. seeds. self-fertile.
Vanilla, secretion of nectar.
Verbascum lychnitis. -- nigrum. -- phoeniceum. -- thapsus. measurements. self-fertile.
Verlot on Convolvulus tricolor. intercrossing of Nemophila. of Leptosiphon.
Veronica agrestis. -- chamaedrys. -- hederaefolia.
Vicia faba. -- hirsuta. -- sativa.
Victoria regia.
Villarsia parnassifolia.
Vilmorin on transmitting character to offspring.
Vinca major. -- rosea.
Viola canina. -- tricolor. measurements. superiority of crossed plants. period of flowering. effects of cross-fertilisation. seeds. partially sterile. corolla removed.