WRECK OF THE ROTHSAY CASTLE STEAMER. The Rothsay Castle was a steam packet which formerly traded on the Clyde. She belonged to the line of steamers which sailed from Liverpool to Beaumaris and Bangor, and was furnished with one engine only. She was commanded by Lieut. Atkinson. At ten o'clock on the -- of August, 1831 the vessel was appointed to sail from the usual place, George's Pierhead, but a casual delay took place in starting, and it was eleven o'clock before she had got every thing in readiness. Whilst taking passengers on board, a carriage arrived at the Pierhead for embarkation. It belonged to M. W. Foster, Esq. of Regent's park, London, who, with his wife and servant, were conveyed in it to the packet, and took their passage at the same time. They were all subsequently drowned, a little dog which accompanied them being the only survivor of this unfortunate group. When the steamer left the Pierhead her deck was thronged with passengers. The captain, crew, musicians, &c. amounted to fifteen, in addition to whom, it was supposed by persons who saw the vessel sail that one hundred and ten or one hundred and twenty souls were on board. The majority of the passengers consisted of holyday and family parties, chiefly from country places; and in one of these companies, who came on a journey of pleasure from Bury, the hand of death committed a merciless devastation. It consisted of twenty-six persons; in the morning, joyous with health and hilarity, they set out upon the waves, and when the shades of that evening approached, every soul but two saw his last of suns go down.