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Figure 2 Walter Holbrook Gaskell on the left and assistant with crocodile in the Cambridge Physiological Laboratory. Gaskell employed young crocodiles from Ceylon in his studies on the cardiac effects of the vagus and sympathetic nerves. (From Franklin, KJ. Joseph Barcroft, Oxford: Blackwell, 1953. Reprinted with permission of Blackwell Science LTD and reproduced by the Wellcome Library, London.)