Acousticks , which are yet nameless, unless we call them Acousticks , Diacousticks , and Catacousticks , or (in another Sense, but to as good Purpose) Phonicks , Diaphonicks , and Cataphonicks .
I. Direct Vision has been improv'd two ways, ex parte Objecti, and ex parte Organi vel Medii.
- Ex parte Objecti, Direct Vision has receiv'd advantages by the Arts of Producing, Conserving and Imitating Light and Colours, which are the Objects of Vision.
- For the Art of Producing Light, we have the Frication of all hard Bodies that beget Fire; especially of the Flint and Steel; and instead of the Flint, most hard Stones (as well as the Cane) may be us'd to the same effect, as upon trial I have found. Add hereto the lately invented Phosphorus, which is a new and admirable way of producing a Lucid Substance by Art, out of a Body in itself not Lucid; and therefore may not unfitly be term'd an Artificial production of Light.