Note f — BOOK VII.
Reading edition
The Gizzard is not only made very strong, especially in the Granivorous; but hath also a Faculty of Grinding what is therein. For which Purpose, the Bird swalloweth rough Stones down, which, when grown smooth, are rejected and cast out of the Stomach, as useless. This Grinding may be heard in Falcons, Eagles, &c. by laying the Ear close to them, when their Stomachs are empty, as the famous Dr. Harvey saith. De Generat. Exer. 7.
As to the Strength of the Gizzard, and the Use of Stones to the Digestion of Fowls, divers curious Experiments may be met with, try’d by Seigneur Redi, with glass Bubbles, solid Glass, Diamonds, and other hard Bodies. See his Exp. Nat.