Draft letter, from Sir John Herschel to Edward Sabine, dated at Collingwood Draft letter. [Charles] Lyell, [Roderick] Murchison, and John Frederick William Herschel will speak at B.A.A.S. [T. R.] Robinson should be notified that he will not need to speak at the meeting. Sees few advantages to combining all existing scientific soc 8 July 1846