Glimpses of Robert Boyle there are, however, in those first years of the Restoration. Up to the very end of 1659 he had been living in Oxford, making the journey by coach now and then between Oxford and the London of his tastes. He was busy with his air-pump and his laboratory experiments and the publication of his _Seraphick Love_, and he was in correspondence with Dick Jones and Henry Oldenberg in Paris, and with Evelyn and Hartlib in London. “Your most noble letter,” writes Hartlib to Boyle at Oxford; but Boyle’s letters of this date to Hartlib do not seem to be extant. Hartlib’s to Boyle were full of all sorts of gossip, home and foreign, and political even more than scientific. For Hartlib, in his old character of universal newsagent, was still able to pick up little bits of information at Westminster and in the City; and he sent Boyle a good deal of gossip about the intrigues and factions of those last months of anarchy under Monk’s dictatorship; about Bradshaw’s death, and the movements of Lambert, Desborough, Fleetwood, Vane, and Monk himself; and the mysterious person of whom he wrote as “C. S.,” over the water. And when “C. S.” was actually back in London and the Restoration was a _fait accompli_, Robert Boyle and his air-pump were in London also, both to be received with open arms by the Invisibles, and especially by Evelyn and the good Hartlib, now old and ill, and very poor, since his pension under a Commonwealth Government had stopped. “I went to Chelsey to visit Mr. Boyle,” writes Evelyn,[250] “and see his pneumatic engine perform divers experiments.” And, “To visite Mr. Boyle in Chelsey, and saw divers effects of the Eolipile for weighing aire.”[251]