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Circulation of the blood in the brain of the boy Emanuel Favre

Emanuel Favre, a 13-year-old boy had been accidentally struck in the head with an axe while "helping his master to chop wood ... by laying the branches on the block, he had bent too far forwards and the axe of the master struck him on the head." A (Top): Normal curve. B (Bottom): Curve registered during the respiration of artificial air when the subject was seized with dizziness. (Source: Mosso A. Life of man on the high Alps. Kiesow EL, trans. London: T Fisher Unwin, 1898:249. Public domain.)