Kymograph Tracing of Antibiotics, Ayfirin, Proactinomycia, by Florey, Mid 20th Century

Set of 28 kymograph traces on smoked paper. Fifteen of them are contained in an envelope labelled "Proactinomycin tracings", four are stuck to two card mounts and the rest are loose. Accompanied by typewritten notes for four of the traces, six papers written by Florey and a list of "Material for the Museum of the History of Science". Contained in brown paper packaging.