Copy of draft letter, from Sir John Herschel to Georg Adolph Erman, dated at Collingwood Copy of draft letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. No doubt he has received some of the money granted by the B.A.A.S. Has sent it all to Georg Adolph Erman as he did not know the address of H. J. R. Petersen. Unable to follow Georg Adolph Erman's scientific arguments. Require simplification. 25 March 1871