

444
<p><span style="font-variant: small-caps;">Gamba</span> 2336: «molto pregiata e non comune»; <span style="font-variant: small-caps;">Wellcome</span> IV, 45; <span style="font-variant: small-caps;">Weil</span> cat. 25, n. 156: «The especial interest of this work is Manni's opinions on the invention of spectacles. In the introduction he expresses his pride as Florentine citizen and says that, in addition to all the other discoveries for which she is famous, Florence has also the honour of the invention of spectacles».</p>