RUSKIN, John (1819-1900). Autograph letter signed ('J. Ruskin') to 'Lady Pembroke' [Gertrude Frances, wife of George Herbert, 13th Earl of Pembroke], Corpus Christi College, Oxford, 20 November 1877, apologising for his delay in responding to an invitation ('I have delayed reply to your most kind letter as vainly as rudely'); overwork may not only prevent his coming for an afternoon at Wilton House, but also a visit to Broadlands [home of his close friends, Lord and Lady Mount-Temple], and excusing himself, 'even with the kindest hostesses and hosts -- I feel always not myself in these Elysian domes and fields', 2 pages, 8vo.