Chapter X

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Science in Earnest._ London, 1827.

DAVID BREWSTER. _A Treatise on the Kaleidoscope._

Edinburgh, 1819.

_The Stereoscope_: Its History, Theory and the Construction,
with Its Application to the Fine and Useful Arts and to
Education. London, 1856.

JOSEPH PRIESTLY. _The History and Present State of Discoveries
Relating to Vision, Light and Colours._ London, 1772.