Among some additional MSS., belonging to the Trevelyan family, recently placed in my hands, I find many of especial interest and value in an historical point of view; and, as I know nobody more capable of estimating them than yourself, I have addressed to you the following account of one of the most important. The particulars will be given in greater detail in a volume on the preparation of which I am at present engaged, but it seemed to me that a statement of a few of the most prominent features would be highly acceptable to our Society; and Sir Walter Calverley Trevelyan, who enrolled himself among our Fellows during the last season, has promptly and liberally allowed me so far to anticipate what will appear more at large hereafter.