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References

1. Darwin C. The Expression of the Emotions in Man and Animals, 3rd edn. (Introduction, afterword and commentaries by Paul Ekman. Essay on the history of the illustrations by Phillip Prodger.) London: Fontana, 1999
2. Darwin C. In: Nora Barlow, ed. The Autobiography of Charles Darwin. London: Collins 1958: 47
3. Darwin C. A biographical sketch of an infant. Mind 1877; 7: 285–93
4. Down J.L. Observations on an ethnic classification of idiots. London Hosp Rep 1862; 3: 259–62
5. Lorenz K. Preface. In: The Expression of the Emotions in Man and Animals, by Charles Darwin. London: Phoenix Books, 1965: ix–xiii