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Can the shells of the Anthidia be air-proof, owing to some modification that escapes me? In any case, this impermeability cannot be attributed to the excremental mosaic, which the cocoons of the resin-working Anthidia do not possess, though endowed with an apex of the very best. Shall we find an answer to the question in the varnish with which the silken fabric is impregnated?
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