Some calculations of the number of accidents or deaths which happen in consequence of parturition; and of the proportions of male to female children, as well as of twins, monstrous productions, and children that are dead-born [electronic resource] : Taken from the midwifery reports of the Westminster General Dispensary. With an attempt to ascertain the chance of life at different periods, from infancy to twenty-six years of age; and likewise the proportion of natives to the rest of the inhabitants of London. In a letter to Samuel Foart Simmons, M.D.F.R.S. By Robert Bland, M.D. physician-man-midwife to the Westminster general dispensary read at the Royal Society, May 10, 1781, and published in the philosophical transactions, vol. LXX[.].