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Blethisa multipunctata, stridulation of. Bloch, on the proportions of the sexes in fishes. Blood, arterial, red colour of. Blood pheasant, number of spurs in. Blow-fly, sounds made by. Bluebreast, red-throated, sexual differences of the. Blumenbach, on Man; on the large size of the nasal cavities in American aborigines; on the position of man; on the number of species of man.
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