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.