male, beard of the.
Oranges, treatment of, by monkeys.
Orange-tip butterfly.
Orchestia Darwinii, dimorphism of males of.
Orchestia Tucuratinga, limbs of.
Ordeal, trial by.
Oreas canna, colours of.
Oreas Derbianus, colours of.
Organs, prehensile; utilised for new purposes.
Organic scale, von Baer s definition of progress in.
Orioles, nidification of.
Oriolus, species of, breeding in immature plumage.
Oriolus melanocephalus, coloration of the sexes in.
Ornaments, prevalence of similar; of male birds; fondness of savages
for.
Ornamental characters, equal transmission of, to both sexes, in
mammals; of monkeys.
Ornithoptera croesus.
Ornithorhynchus, reptilian tendency of; spur of the male.
Orocetes erythrogastra, young of.
Orrony, Grotto of.
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