Letter, from Johann Heinrich Mädler and Wilhelm Beer to Sir John Herschel, dated at Berlin Autograph letter signed by sender. The departure of two young missionaries for Africa provide the occasion for Johann Heinrich Mädler and Wilhelm Beer to comment on the present status of work in preparing for printing the Mappa Selenographica, and they ask John Frederick William Herschel's opinion on some suggestions for printing. Have heard from F. W. Bessel of John Frederick William Herschel's sighting of the two inner moons of Saturn. 6 August 1835