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Boyle, Robert, 1627-1691

"Experiments and Considerations Touching Colours (1664)"

Turpe enim existimabam, hujusmodi Gemma ornatus gratia, dum
gratiam nullam haberet, uti. Paret Sculptor redditque Gemmam, quam gesto
pro annulo Signatorio. Vix per mensem gestaram, redit illi pristinus
color, sed non ita nitens propter Sculpturam, ac inaequalem superficiem.
Miramur omnes gemmam, atque id praecipue quod color indies pulchrior
fieret. Id quia observabam, nunquam fere eam a manu deposui, ita ut nunc
adhuc candem gestem._
[32] _Olaus Wormius, in Musae. 18? pag. 186._
[33] _Musae. Worm._ pag. 99.
[34] Arte Vetraria, lib. 7 cap. 102.
* * * * *
OBSERVATIONS
Made this 27th.[35]
of _October_ 1663. about
Mr. _Clayton's_
Diamond.[36]
Being look'd on in the Day time, though in a Bed, whose Curtains were
carefully drawn, I could not discern it to Shine at all, though well
Rubb'd, but about a little after Sun-set, whilst the Twilight yet lasted,
Nay, this Morning[37] a pretty while after Sun-rising, (but before I had
been abroad in the more freely inlightned Air of the Chamber) I could upon
a light Affriction easily perceive the Stone to Shine.


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