We spent two days in Rome, and dined with our friends the Duca and Duchesa di Sermoneta. We were grieved at his blindness, but found him as agreeable as ever. Through our friend, Admiral Acton, I became acquainted with Professor Panceri, Professor of Comparative Anatomy; Signore de Gasparis, who has discovered nine of the minor planets, and is an excellent mathematician, and some others. To these gentlemen I am indebted for being elected an honorary member of the Accademia Pontoniana. We were much interested in Vesuvius, which, for several months, was in a state of great activity. At first, there were only volumes of smoke and some small streams of lava, but these were followed by the most magnificent projections of red hot stones and rocks rising 2,000 feet above the top of the mountain. Many fell back again into the crater, but a large portion were thrown in fiery showers down the sides of the cone. At length, these beautiful eruptions of _lapilli_ ceased, and the lava flowed more abundantly, though, being intermittent and always issuing from the summit, it was quite harmless; volumes of smoke and vapour rose from the crater, and were carried by the wind to a great distance. In sunshine the contrast was beautiful, between the jet-black smoke and the silvery-white clouds of vapour. At length, the mountain returned to apparent tranquillity, though the violent detonations occasionally heard gave warning that the calm might not last long. At last, one evening, in November, 1868, when one of my daughters and I were observing the mountain through a very good telescope, lent us by a friend, we distinctly saw a new crater burst out at the foot of the cone in the Atrio del Cavallo, and bursts of red-hot lapilli and red smoke pouring forth in volumes. Early next morning we saw a great stream of lava pouring down to the north of the Observatory, and a column of black smoke issuing from the new craters, because there were two, and assuming the well-known appearance of a pine-tree. The trees on the northern edge of the lava were already on fire. The stream of lava very soon reached the plain, where it overwhelmed fields, vineyards, and houses. It was more than a mile in width and thirty feet deep. My daughters went up the mountain the evening after the new craters were formed; as for me, I could not risk the fatigue of such an excursion, but I saw it admirably from our own windows. During this year the volcanic forces in the interior of the earth were in unusual activity, for a series of earthquakes shook the west coast of South America for more than 2,500 miles, by which many thousands of the inhabitants perished, and many more were rendered homeless. Slight shocks were felt in many parts of Europe, and even in England. Vesuvius was our safety-valve. The pressure must have been very great which opened two new craters in the Atrio del Cavallo and forced out such a mass of matter. There is no evidence that