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A letter to the learned Caleb Cotesworth ... Containing, a comparison between the mortality of the natural small pox, and that given by inoculation ... To which is subjoined, an account of the success of inoculation in New England; as likewise an extract from several letters concerning a like method of communicating the small pox, that has been used time out of mind in South Wales / [James Jurin]. Public Domain Mark. Source: Wellcome Collection.