Note 115 — PART II
Reading edition
These plates are obtained from the shell of the Placuna placenta, a mollusk; they are generally used in place of window-glass, and by their partial opacity modify the effects of the sun’s heat.—Eds. ↑
Reading edition
These plates are obtained from the shell of the Placuna placenta, a mollusk; they are generally used in place of window-glass, and by their partial opacity modify the effects of the sun’s heat.—Eds. ↑