Observations on the manners and customs of Italy, [electronic resource] : with remarks on the vast importance of British commerce on that continent; also, particulars of the wonderful explosion of Mount Vesuvius, Taken on the Spot at Midnight, in June, 1794, When the beautiful and extensive City of Torre del Greco was buried under the blazing River of Lava from the Mountain; Likewise, AN Account Of Very Many Extraordinary Cures Produced BY A Preparation Of Opium, In A Variety Of Obstinate Cases, According To The Practice In Asia; With many Physical Remarks collected in Italy, well deserving the Attention of most Families. By a gentleman authorised to investigate the commerce of that country with Great-Britain.