Letter from Richard Johnson, Great Portland Street, to Sir Joseph Banks Acting as executor for Colonel Thomas Deane Pearse, he sends meteorological journals kept by the Colonel. The experiments were made at the Colonel's country house, named Purry Baag, situated on the Ganges, 'a few miles below Calcutta [Kolkata] in Bengal'. He notes Pearse's accuracy and ability in mathematical sciences. 27 November 1790