My health was never good at Chelsea, and as I had been working too hard, I became so ill, that change of air and scene were thought absolutely necessary for me. We went accordingly to Paris; partly, because it was near home, as Somerville could not remain long with us at a time, and, partly, because we thought it a good opportunity to give masters to the girls, which we could not afford to do in London. When we arrived, I was so weak, that I always remained in bed writing till one o'clock, and then, either went to sit in the Tuileries gardens, or else received visits. All my old friends came to see me, Arago, the first. He was more engaged in politics than science, and as party spirit ran very high at that time, he said he would send tickets of admission to the Chambers every time there was likely to be an “orage.” When I told him what I was writing, he gave me some interesting memoirs, and lent me a mass of manuscripts, with leave to make extracts, which were very useful to me. General de La Fayette came to town on purpose to invite Somerville and me to visit him at La Grange, where we found him living like a patriarch, surrounded by his family to the fourth generation. He was mild, highly distinguished, and noble in his manners; his conversation was exceedingly interesting, as he readily spoke of the Revolution in which he had taken so active a part.