| Resumo: | In reviewing recent progress in the chemistry of leprosy treatment one is not impressed so much by any really new discovery as by the fact that so little was definitely known or generally accepted five years ago. It is not difficult to pick out important facts now widely accepeted and made use of in the treatment of leprosy, and to note that someone knew (or at least believed) this, that, and the other, ten, one hundred, or one thousand years ago. It is important, however, to recall that such quasi knowledge was so confounded with erroneous beliefs as to have very little effective value.
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