Letter, from Sir John Herschel to Henry Kater, dated at [London] Autograph letter signed by sender. Examine reflecting theodolite by [?] Schenk, now at Edward Troughton's. Arrangements for Madeira expedition. James South is willing to make observations there. 'Bowdich (the African)' is now at Teneriffe or Madeira and needs employment. William Herschel's health. 28 June 1822