May 21. 1672. Trin. Coll.


Tis now more then a fortnight since in answer to yor last letter May 2d, I returned you some considerations on M. Cassegrains designe for refining ye Telescope &|A|nd to yor suggestion that when my an{g}|s|wer to Mr Hooks & Father Pardies Objections should be printed, the names of the Objectors, especially if they desired, might be omitted; I told you that it was indifferent to me whether they were printed wth or without the Authors names, I being concerned in the matter of those objections without respect to their persons. But yet I understood not yor desire of leaving out Mr Hooks name, if because the contents would discover their Author unlesse the greatest ꝑt of them should be omitted & the rest put into a new Method wthout having any respect, to ye Hypothesis of colours described in his Micrographia. And then they would in effect become new objections & reque|i|re another Answer then what I have written. And I know not whether I should dissatisfy them that expect my answer to these that are already sent to me.

But yet upon the receipt of yor letter I deferred the sending those things wch are already writ I intended, & have determined to send you alone a part of what I prepared, as I told you, to accompany my Answer; for ye sake of wch I have hitherto suspended it. The subject of this discourse is the Phænomena of Plated Bodies, concerning wch I shall by experiments first show how according to their severall thicknesses they reflect or transmit the rays indued wth severall colours, & then consider the relation wch these this|n| transparent Plates have to ye parts of other naturall Bodies, in order to a fuller understanding of the cases of their colours also. And this I purpose to send becis|u|se it most properly apperteines to ye former discourse of light, being a declaration of the different reflectibility of the severall sorts of rays, as that was of their different refrangibility. I onely expect yor answer to my last & this, & then my next may conteine yor ans this Subject. In the meane time I rest

Yor humble Servant

I. Newton



To Henry Oldenburg Es at his house about the middle of the old Pall-Maile in Westminster



Rec. May 22. 72.

Answ. May 23.

Answ Wrote again May june, and pressed His Answ. to Hook putting him in mind of {his} premiss and desiring to acknowledge tardies Candid return.

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