Unpublished letter, regarding errors in philosophy from Michael Shipman to Alexander Hogg Shipman writes about 'errors' he finds in modern philosophy, including regarding the formation of rain, which he writes is caused by wind, the formation of meteors, and the cause of the tides, a subject on which he believes Sir Isaac Newton made 'mistakes'. He does not explain his own theory on this front. He states that he is writing a 'system' of natural philosophy, and offers to present it to the Royal Society. Subject: Natural Philosophy Written by Shipman in Hinckley [Leicestershire, England]. Addressed to Hogg at King's Arms, No 16 Paternoster Row, London. 17 January 1789