Wellcome Symposium on Historical Aspects of Neurosciences, London, 19 April 1991 Katz was intending to give a lecture, but was forced to withdraw due to ill health. Correspondence with Wellcome Trust re invitation, programme, arrangements and ill health, three draft copies of his lecture 'Two centuries of neuroscience - a brief survey'. Also typescript notes for a lecture titled 'Chemical wave transmission' given at Leipzig in 1990. 1990-1991