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BURNDY
LIBRARY
Charter* d m I?-#!
GIFT OF
Bern Dibner
The Dibner Library of the History of
Science and Technology
SMITHSONIAN INSTITUTION LIBRARIES
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ADVERTISEMENT.
PArt of the enfuing Difcourfe about Light was written at the defire of some Gentlemen of the Royal Society, in the Tear 1675. and then fent to their Secretary, and read at their Meetings, and the reft was added about
Twelve Tears after to complete the Theory; except the
Third Book, and the lajt Proportion of the Second, which were Jince put together out offcattered Papers. To avoid being engaged in Difputes about thefe Matters, I have hitherto delayed the Printing, and jhould fill have de¬
layed it, had not the importunity of Friends prevailed upon me. If any other Papers writ on. this Suh\eB are got out of my Hands they are imperfeff, and were perhaps written before / had tried all the Experiments here fet down, and fully fatisfied m…