It would be an authority far bolder than this which would dare affirm that the Recollections of Seventy Years, by Mr. F. B. Sanborn, of Concord, were autobiography of a new sort; they are of the good old, personal sort, such as autobiographies have been from the beginning, now more intimate, now less, but always openly, and from their nature, confidential. We could not insistently say that they were even of a new shape, though we do not recall, offhand, another autobiography which divides itself quite so distinctly. When the reader comes to the two volumes of them he…