Note 8 — LETTERS AND OTHER PIECES.

Harleian MS. 3360: a treatise on Optics, entitled “A minute or first draught of the Optiques. In two parts. By Thomas Hobbes. At Paris, 1646.” The second part, On Vision, we have in Latin, in the DE HOMINE: the first, On Illumination, was never published. The dedication to the Marquis of Newcastle, and the concluding paragraph, is all that is here given of the treatise.