I hope Mr Linus's Friends will acquiesce in the late tryall of the Experiment in debait, for the procurement of which & for sending them notice of the event, I return you my hearty thanks, as I have reason. I perceive I went upon a wrong supposition in what I wrote concerning Mr Boyles Experiment The Papers in your hand I have no present need of: You may send them at your best leisure. Sometime this Sommer it's possible I may make use of them, if I can but get some time to write the other discourse about the colours of the Prism which I have long intended. Sir I am

Your humble & obliged


Is. Newton.

May 11th 1676.


For Henry Oldenburg Esq.
at his house about the middle
of the old Pal-mall in




< insertion from lower down f 52v >

Received d. 12. Maji. 1676.

< text from f 52v resumes > < insertion from lower down f 52v >

Answered by Dr Sidnam May 15. 76. and sent by him his Hypothesis explaining the properties of Light; as also his discourse about the various colors exhibited by transparent substances made very thin by being blown into bubbles or otherwise formed into plates, altho at a greater thicknes they appear very clear and colorlesse.

In my letter accompanying these papers I imparted to Mr Newton the particulars contained in M. Leibnitz his letter to me of May 12. 1676. from Paris st.n.

< text from f 52v resumes >

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