Letter, from Giovanni Antonio Plana to Sir John Herschel, dated at Turin Autograph letter signed by sender. Comments on communications with the Cape. James Stewart (Margaret Herschel's brother) is well liked by the family. Giovanni Plana is sending on his meteorological observations, noting that he has reduced his emphasis on astronomy. Is working on a long memoir on integral calculus. [Many parts of the letter are illegible.] 12 May 1836