An explanation of the causes why vaccination has sometimes failed to prevent small-pox : and also a description of a method confirmed by experience, of obviating such causes. (Part the second.).

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An explanation of the causes why vaccination has sometimes failed to prevent small-pox : and also a description of a method confirmed by experience, of obviating such causes. (Part the second.). Public Domain Mark. Source: Wellcome Collection.

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This material has been provided by the Harvey Cushing/John Hay Whitney Medical Library at Yale University, through the Medical Heritage Library. The original may be consulted at the Harvey Cushing/John Hay Whitney Medical Library at Yale University.