Some observations on the varioloid disease, which has lately prevailed in Edinburgh, and on the identity of chicken-pox and modified small-pox, in a letter addressed to Dr. Duncan, junior / [John Thomson].

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Some observations on the varioloid disease, which has lately prevailed in Edinburgh, and on the identity of chicken-pox and modified small-pox, in a letter addressed to Dr. Duncan, junior / [John Thomson]. Public Domain Mark. Source: Wellcome Collection.