Historical scholar, spent his life at Venice in the study of Italian history, especially in its relation to English history, which he prosecuted with unwearied industry; his great work, work of 20 years' hard labor, "Calendar of State Papers and Manuscripts relating to English Affairs existing in the Archives of Venice and Northern Italy," left unfinished at his death; died at Venice, where he spent a great part of his life, where Ruskin found him and conceived a warm friendship for him (1803-1883).