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Portax picta, dorsal crest and throat-tuft of; sexual differences of colour in. Portunus puber, pugnacity of. Potamochoerus pencillatus, tusks and facial knobs of the. Pouchet, G., the relation of instinct to intelligence; on the instincts of ants; on the caves of Abou-Simbel; on the immunity of negroes from yellow fever; change of colour in fishes.
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