Publisher's Synopsis
Excerpt from A Treatise on New Philosophical Instruments, for Various Purposes in the Arts and Sciences: With Experiments on Light and Colours
The discovery of a new property impres sed upon light, by transmission through the agate, opened a still wider and more allur. Ing field Of enquiry; 'and though this sub ject was not immediately Con nected' with the description of any Instrument, I prose cuted it with renewed zeal, and examined the variations which light, thus modified.
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