Note 781 — ARTIFICIAL PEARLS.
William Johnston translation
These silver-coloured particles were examined by Reaumur, who gave a description of them in Histoire de l’Académie, année 1716, p. 229. [In the scales of fishes, the optical effect is produced in the same manner as in the real pearl, the grooves of the latter being represented by the inequalities formed by the margins of the concentric laminæ of which the scales are composed.]