Soon after Hamilton arrived in Naples, Mount Vesuvius began to show signs of activity and in the summer of 1766 he sent an account of an eruption, together with drawings and samples of salts and sulphurs, to the Royal Society in London. On the strength of this paper he was elected a Fellow of the Royal Society. In the autumn of 1767 there was an even greater eruption and again Hamilton sent a report to the Royal Society. The two papers were published as an article in the Society's journal Philosophical Transactions.