Sunday 19 August 1666
(Lord’s day). Up and to my chamber, and there began to draw out fair and methodically my accounts of Tangier, in order to shew them to the Lords. But by and by comes by agreement Mr. Reeves, and after him Mr. Spong, and all day with them, both before and after dinner, till ten o’clock at night, upon opticke enquiries, he bringing me a frame he closes on, to see how the rays of light do cut one another, and in a darke room with smoake, which is very pretty. He did also bring a lanthorne with pictures in glasse, to make strange things appear on a wall, very pretty. We did also at night see Jupiter and his girdle and satellites, very fine, with my twelve-foote glasse, but could not Saturne, he being very dark. Spong and I had also several fine discourses upon the globes this afternoon, particularly why the fixed stars do not rise and set at the same houre all the yeare long, which he could not demonstrate, nor I neither, the reason of. So, it being late, after supper they away home.
But it vexed me to understand no more from Reeves and his glasses touching the nature and reason of the several refractions of the several figured glasses, he understanding the acting part, but not one bit the theory, nor can make any body understand it, which is a strange dullness, methinks.
I did not hear anything yesterday or at all to confirm either Sir Thos. Allen’s news of the 10 or 12 ships taken, nor of the disorder at Amsterdam upon the news of the burning of the ships, that he [De Witt] should be fled to the Prince of Orange, it being generally believed that he was gone to France before.