over the surface of the earth, waving about like the flame of weak spirits of wine; this flame burnt some moments. On putting a light to the bubbles which rose through the water they inflamed, and sometimes a flame ran quickly from them over the whole surface of the water. I filled a bottle with the gas, but I could not distinguish any smell in it. In pouring water into the bottle, and lighting the jet of gas that came out, a large clear flame was obtained. The whole of this flame was a very pale blue, like spirits of wine. It inflamed paper and matches readily, as might be expected; and when I held a dry bottle or knife over it, they appeared to become dim by condensing water: but this was uncertain, as the weather was so rainy. The water had no taste, and appeared pure rain water. I brought some of it and the gas away, and returned to the village." In the "almost deserted laboratory of the Florence Academy" experiments with the Pietra Mala gas convinced Davy that it was "light hydrocarburet, pure." The second stay in Rome extended over nearly four months, during which time the grand Carnival took place. Faraday had at this part of his tour a great deal of his time to himself, and earnestly devoted himself to continuing the study of the French and Italian languages, on which indeed he had been working all the while he had been away from home. But he also continued his observations on men and manners, for during the Carnival week he twice attended masked balls in a domino, besides being present at the horse-races on the Corso, and at other of the events of the Carnival. He was, however, anxious to be on his way home to England, and his letters occasionally show how sad he felt at not knowing how soon the return would be. It was, however, to be earlier than he anticipated. On January 25th, 1815, he wrote to Abbott: "Now for news! We shall part in a few weeks (pray write quickly) for Naples, and from thence proceed immediately to Sicily. Afterwards our road is doubtful; but this much I know, that application is made for passports to travel in the Turkish Empire, and to reside in Constantinople; that it is Sir Humphry's intention to be among the Greek islands in March, and at Athens early in the spring.... Adieu, dear friend. With you I have no ceremony. The warmest wishes that friendship can dictate are formed for you by M. Faraday." Thus had he written towards the end of January--within three months he was to be shaking hands with his friend at home!