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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

            OF 

               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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