Randal Thomas Mowbray Rawdon Berkeley, Eighth Earl of Berkeley, Foxcombe, to AW Porter On testing Porter's formula. The letter refers to Berkeley's recent paper, 'The Determination of the Osmotic Pressures of Solutions by the Measurement of their Vapour Pressures', 'Proceedings of the Royal Society of London. Series A', Vol. 77, No. 515, Feb. 8, 1906 29 May 1908