c. 1440. Bone Flor., 390. An egyll and a charbokull stone.
1601. Holland, Pliny, II. 590. The Ægle-stones called Aëtites…: and it is said that … without them the Ægles cannot hatch.
1686. Lond. Gaz., No. 2126/4. An Eagle Stone, tied up in a piece of black Ribon … lost the 29th Instant.
1753. Chambers, Cycl. Supp., s.v. Ætites, The finest and most valued of all the eagle-stones, are accidental states of one or other of our common pebbles.
1796. Morse, Amer. Geog., II. 16. Norway produces crystals,… thunder-stones, and eagle-stones.
1879. Syd. Soc. Lex., s.v. Aetites, The eagle-stone; a stone, hollow and containing another substance within it; the … shell of clay-iron stone; the … nucleus, of variable composition.
