Nolanaceae.
Nymphaea.
Odours emitted by flowers attractive to insects.
Ogle, Dr., on Digitalis purpurea.
Gesneria.
Phaseolus multiflorus.
perforation of corolla.
case of the Monkshood.
Onagraceae.
Onion, prepotency of other pollen.
Ononis minutissima.
measurements.
seeds.
self-fertile.
Ophrys apifera.
-- muscifera.
Oranges, spontaneous crossing.
Orchideae.
excretion of saccharine matter.
Orchis, fly.
Origanum vulgare.
measurements.
early flowering of crossed plant.
effects of intercrossing.
Paeony, number of pollen-grains.
Papaveraceae.
Papaver alpinum.
-- argemonoides.
-- bracteatum.
-- dubium.
-- orientale.
-- rhoeas.
-- somniferum.
-- vagum.
measurements.
number of capsules.
seeds.
prepotency of other pollen.
Papillae of the Viola tricolor attractive to insects.
Parsley.
Passiflora alata.
-- gracilis.
measurements.
crossed and self-fertilised.
seeds.
self-fertile.
Passifloraceae.
Pea, common.
Pelargonium zonale.
measurements.
effects of intercrossing.
almost self-sterile.
Pentstemon argutus, perforated corolla.
Petunia violacea.
measurements.
weight of seed.
cross with fresh stock.
relative fertility.
colour.
summary of experiments.
superiority of crossed over self-fertilised.
early flowering.
uniform colour of self-fertilised.
seeds.
self-sterile.
Phalaris canariensis.
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