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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.
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