OF THE NINTH MEETING OF THE BRITISH ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE; HELD AT BIRMINGHAM IN AUGUST 1839. LONDON: JOHN MURRAY, ALBEMARLE STREET. 1840. REPORTS OF RESEARCHES IN SCIENCE. Report on the present state of our knowledge of Refractive Indices for the Standard Rays of the Solar Spectrum in different media. By the Rev. Baden Powell, M.A., F.R.S., F.G.S., F.R. Ast. S., Report on the application of the sum assigned for Tide Calcula- |