Copy letter, from Sir John Herschel to N. Spahr, dated at Collingwood Copy of letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. As John Frederick William Herschel has not heard from NS, he has arranged for Madame Gerlach to stay with Mrs. Mason, now living in part of John Frederick William Herschel's former residence at Slough. But under no circumstances can Madame Gerlach return to her duties with John Frederick William Herschel's family. 31 December 1843