Soon after my dear husband's death, we went to Spezia, as my health required change, and for some time we made it our headquarters, spending one winter at Florence, another at Genoa, where my son and his wife came to meet us, and where I had very great delight in the beautiful singing of our old friend Clara Novello, flow Countess Gigliucci, who used to come to my house, and sing Handel to me. It was a real pleasure, and her voice was as pure and silvery as when I first heard her, years before. Another winter we spent at Turin. On returning to Spezia in the summer of 1861, the beautiful comet visible that year appeared for the first time the very evening we arrived. On the following, and during many evenings while it was visible, we used to row in a small boat a little way from shore, in order to see it to greater advantage. Nothing could be more poetical than the clear starlit heavens with this beautiful comet reflected, nay, almost repeated, in the calm glassy water of the gulf. The perfect silence and stillness of the scene was very impressive.

I was now unoccupied, and felt the necessity of having something to do, desultory reading being insufficient to interest me; and as I had always considered the section on chemistry the weakest part of the connection of the “Physical Sciences,” I resolved to write it anew.