Today is World Meteorological Day, so we're celebrating the 19th century's most renowned meteorologist, physicist and chemist, John Dalton (1766-1844). Dalton was made the first honorary member of The Portico, on the condition he came to 'superintend the going of the clock'. His 'Meteorological Observations and Essays' was among the first 610 books added to the library's collection, and was present in the 1810 catalogue. Dalton is best known for introducing the atomic theory into chemistry, and for pioneering research into colour blindness. The Portico was known to be 'one of his favourite haunts'.