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Placing two unisonant forks near each other, sweeping the bow over one of them, and then quenching the agitated fork, the other continues to sound; this other can re-excite the former, and several transfers of sound between the two forks can be thus effected.
And as the birds breed in communities, often very populous, and all clamour together, the effect of so many powerful and unisonant voices is very grand; but it differs in the two species, owing to the quality of their voices being different; the storm of sound produced by the black-backs is deep and solemn, while that of the herring-gulls has a ringing sharpness almost metallic.
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