On the 21st of June, the Marquis Cornwallis, whose name is so familiar in American and East Indian history, arrived in Dublin, to assume the supreme power, both civil and military. As his Chief Secretary, he recommended Lord Castlereagh, who had acted in that capacity during the latter part of Lord Camden's administration in consequence of Mr Pelham's illness; and the Pitt-Portland administration appointed his lordship accordingly, because, among other good and sufficient reasons, "he was so unlike an Irishman."