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Notes from a London meeting with Sir Isaac Newton on a revised plan for the Astronomiae physicae et geometricae elementa, (1702), Gregory's most important work. An erratum lies at the foot of this document, unrelated to it or to any of the other things on the sheet (which have their own entries in Gregory's index): a jotting about refraction, crystals, and cataracts of the eye. This is dated London, 30 May 1708.

Scope and Contents A logarithmic treatment of light propagating through a uniform medium. John Keill was an Edinburgh native who earned distinction under David Gregory in mathematics and natural philosophy there, and who followed him to Oxford in 1691, where, like Gregory, he made a name for himself as an enthusiastic vindicator of Sir Isaac Newton. At Balliol College he demonstrated by experiments the validity of some of the chief propositions of Newton concerning light and colour, among other things. Oddly,...