Edited transcript of a Witness Seminar held at the Wellcome Institute for the History of Medicine, in London, on 12 May 1998. First published by the Wellcome Trust, 2000. ©The Trustee of the Wellcome Trust, London, 2000. All volumes are freely available at www.history.qmul.ac.uk/research/modbiomed/wellcome_witnesses/Annotated and edited transcript of a Witness Seminar held on 12 May 1998. Introduction by E M Tansey.Annotated and edited transcript of a Witness Seminar held on 12 May 1998. Introduction by E M Tansey.Annotated and edited transcript of a Witness Seminar held on 12 May 1998. Introduction by E M Tansey.Annotated and edited transcript of a Witness Seminar held on 12 May 1998. Introduction by E M Tansey.The introduction of penicill...