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 ... With an attempt to ascertain the chance of life at different periods ... and likewise the proportion of natives to the rest of the inhabitants of London. In a letter to Samuel Foart Simmons ... Read at the Royal Society, May 10, 1781, and published in the Philosophical transactions, vol. LXXI / by Robert Bland.

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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 ... With an attempt to ascertain the chance of life at different periods ... and likewise the proportion of natives to the rest of the inhabitants of London. In a letter to Samuel Foart Simmons ... Read at the Royal Society, May 10, 1781, and published in the Philosophical transactions, vol. LXXI / by Robert Bland. Public Domain Mark. Source: Wellcome Collection.