Advertisement II.

IN this Second Edition of thefe Opticks I have o-Tracts publifb'd at the End of the Former Edition, as not be-longing to the Subject.

And at the End of the Tbird Book I bave added fome 2ueftions.

And to Fbew that I do not Take Gravity for an Effential Property of Bodies, I have added one 2ueftion concerning its Caufe, cbufing to propofe it by way of a 2ueftion, becaufe I am not yet fatisfied about it for want of Experiments.

July 16.

1717. I. N.

ERRATA.

Pap. 342. Lin. 6. For feven, read feven and 4 half. Ib. Lin. 8. For 14, read 15, Ib. Lin. 10, for 21, 28, or 35, read 22.50 , 30 or 38. Ib .lin. 21. For 70 , 140, 210 . Read 76, 152, 228. Pag. 366. I. 22. For beigbi read diftavce.

THE

FIRST BOOK

OPTICKS.

P A R T I

M Y Defign in this Book is not to Explain the Properties of Lighr by Hypothefes, but to propofe and prove them by Reafon and Experiments: In other to which I fhall permife the following Definitions and Axioms.

B DEFI-

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Top 9 Aristotle Quotes

We square measure what we tend to repeatedly do. Excellence, then, isn't Associate in Nursing act, however a habit. Top 9 Aristotle Quotes The whole is quite the total of its components. A friend to all or any may be a friend to none. Man is naturally a political animal. Happiness depends upon ourselves. Patience is bitter, however its fruit is nice. One swallow doesn't create a summer, neither do you fine day; equally at some point or transient time of happiness doesn't create someone entirely happy. The law is reason, free from passion. Educating the mind while not educating the center isn't any education in the least. It is the mark of an informed mind to be able to entertain an idea while not acceptive it.

Albert Einstein

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D E F I N. II.

And therefore might Rays and Refractions be confidered, it light-weight be propagated in Associate in Nursing inftant. however be Associate in Nursing Argument taken from the AEquations of the days of the Eclipfes of jupiter's Satellites it feems that light-weight is propagated in time, Fpending in its paffage from the Sun to U.S.A. regarding feven Minutes of time: and so I even have chofen to outline Rays and Refractions in fuch general terms as might conform to light-weight in each cafes. D E F I N. III. Reflexibility of Rays, is their Difpofition to be mirrored or turned back to the celebrity Medium from the other Medium upon whofe Surface they fall. And Rays square measure a lot of or lefs reflxible, that square measure turned back a lot of or lefs eafily. As if light-weight pafs out of Glafs into Air, and by being inclined a lot of and a lot of to the common Surface of the Glafs and Air, begins at length to be completely mirrored by that Surface; thofe forts of Rays that at l...

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