8 May 1656 – 14 May 1656

I went to visit Dr. Wilkins, at Whitehall, when I first met with Sir P. Neal, famous for his optic glasses. Greatorix, the mathematical instrument maker, showed me his excellent invention to quench fire.

Was published my "Essay on Lucretius," with innumerable errata by the negligence of Mr. Triplet, who undertook the correction of the press in my absence. Little of the Epicurean philosophy was then known among us.