monumenta.ch > Beda Venerabilis > 66 > uwbM.p.th.f.69.43 > 42

Plinius Plinius, Naturalis Historia, 37, 196
{LXXXV} Nunc communiter ad omnium gemmarum observationem pertinentia dicemus opiniones secuti auctorum. Cavae aut extuberantes viliores videntur aequalibus. figura oblonga maxime probatur, deinde quae vocatur lenticula, postea epipedos et rotunda, angulosisi autem minima gratia.

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