, on denudation
Hornbill, remarkable instinct of
Horns, rudimentary
Horse, fossil in La Plata
--proportions of, when young
Horses destroyed by flies in Paraguay
--striped
Horticulturists, selection applied by
Huber on cells of bees
Huber, P., on reason blended with instinct
--on habitual nature of instincts
--on slave-making ants
--on Melipona domestica
Hudson, Mr., on the Ground-woodpecker of La Plata
--on the Molothrus
Humble-bees, cells of
Hunter, J., on secondary sexual characters
Hutton, Captain, on crossed geese
Huxley, Prof., on structure of hermaphrodites
--on the affinities of the Sirenia
--on forms connecting birds and reptiles
--on homologous organs
--on the development of aphis
Hybrids and mongrels compared
Hybridism
Hydra, structure of
Hymenoptera, fighting
Hymenopterous insect, diving
Hyoseris
Ibla
Icebergs transporting seeds
Increase, rate of
Individuals, numbers favourable to selection
--many, whether simultaneously created
Inheritance, laws of
--at corresponding ages
Insects, colour of, fitted for their stations
--sea-side, colours of
--blind, in caves
--luminous
--their resemblance to certain objects
--neuter
Instinct, not varying simultaneously with structure
Instincts, domestic
Intercrossing, advantages of
Islands, oceanic
Isolation favourable to selection
Japan, productions of
Java, plants of
Jones, Mr.
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