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Cum denique ex observatione nostra manifestum sit, revera Tintlam esteGemmam Chalcedoniam , quamvis fortuito acciderit, neque repetito Procestusimile quid evenerit, merebitur tamen Meditationem, an ex Astrorum Fluxualiave abscondita potius vi venerit, & Tentamen, an ex Mixtura Salium &

Succorum Acrium possit imitando produci ejusmodi Tinctura, & quidem sineIgne, ut Splendor & Pelluciditas Gemmae non destruatur, Durities autemmaneat, adeoque ipsa Gemmas pretiositas non tantum servetur, sed & perTincturam novam crescat.

X. Papers Omitted.

I. A Description of Scheiners Stcreograpbick. Parallelogramm and it’s Jm- 96. f.608;»pcrftttions considered ; by Mr. J.St.Clarc. vid. sep. Sect. II.

1. A Table of Simple and Mixt Colours in Latin , Greel^, Frencb , and Eng- n.i7?-?-24,2S.U(h: with a Specimen of each Colour prefixt to its proper Name ; by Mr. BJcb.

Waller.

XI. Accounts of Bookj Omitted. n. 21. z8;j

i. Entretiens für les Vies & für Ies Ouvrages des plus excellens Peintres, n * 3?. f. 784*.Anciens & Modernes ; par M. Fclibien.

x. An Idea of the PcrfeBion of Painting : Originally written in Frencb byHpland Freart Sieur de Cambray ; and rendred Englißo by J. Evelin,Ef^ F. R. S. n. 47. p. 954*.Lond. 1668. in 8 vo. .

z. A General Idea of the Art of Painting, and a Relation of Seven Con-ferences held at Paris in the Academy Hpyal for the Improvement of the Arts n. 8tf. f. 5048*of Painting and Sculpture.

4. Optique de Portraiture & Peinture, contenant la PerfpeBive Specula-tive & Pratique Accomplie, &c. par Gregoire Huret , de 1 * Academie Royale dePeinture & Sculpture, a Paris. l 6 jo. in FoL

CHAF