28 March 1661 – 3 April 1661

Dr. Heylin (author of the "Geography") preached at the Abbey, on Cant. v. 25, concerning friendship and charity; he was, I think, at this time quite dark, and so had been for some years.

This night, his Majesty promised to make my wife Lady of the Jewels (a very honorable charge) to the future Queen (but which he never performed).

I dined with that great mathematician and virtuoso, Monsieur Zulichem, inventor of the pendule clock, and discoverer of the phenomenon of Saturn's annulus: he was elected into our Society.