Published online by Cambridge University Press: 19 February 2018
Studies of the mind of man and of the heart of the frog, though normally deeply divided, can be bridged when two postulates are granted. The first postulate is that the quality of excitability, on which nerve-cell activity is based, can be studied in any other excitable tissue; the second is that mental activity, as we know it, depends on the presence of excitable nerve-cells in the brain. The postulates being granted, it becomes legitimate to apply the results of experiments on excitability performed with the frog's heart in explanation of the mode of working of the brain and mind.
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