...you refer to was published in the Mercury dated March 19th, 1862, no date given to the writing of the same. You have an exact copy, as quoted to me in your letter of August 3d. * * Yours truly, Joseph A. Yates . The order of date of publication of the three extracts from Mr. Porter's letters is reversed in Scharf's history. My note-book, kept at that time, contains, under date of March 20th, 1862, th...