structure of plants adapted to cross and self-fertilisation.
large conspicuous flowers more frequently visited by insects than small
inconspicuous ones.
Solanum generally unattractive to insects.
Lamium album.
on anemophilous plants.
fertilisation of Plantago.
secretion of nectar.
instinct of bees sucking nectar.
bees frequenting flowers of the same species.
cause of it.
powers of vision and discrimination of bees.
Muller, Dr. H., hive-bees occasionally perforate the flower of Erica
tetralix.
calyx and corolla of Rhinanthus alecterolophus bored by Bombus
mastrucatus.
Munro, Mr., some species of Oncidium and Maxillaria sterile with own
pollen.
Myrtaceae.
Nageli on odours attracting insects.
sexual relations.
Natural selection, effect upon self-sterility and self-fertilisation.
Naudin on number of pollen-grains necessary for fertilisation.
Petunia violacea.
Nectar regarded as an excretion.
Nemophila insignis.
measurements.
early flowering of crossed plant.
effects of cross and self-fertilisation.
seeds.
Nepeta glechoma.
Nicotiana glutinosa.
-- tabacum.
measurements.
cross with fresh stock.
measurements.
summary of experiments.
superiority of crossed plants.
early flowering.
seeds.
experiments on.
self-fertile.
Nolana prostrata.
measurements.
crossed and self-fertilised plants.
number of capsules and seeds.
self-fertile.
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