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390   Life and Letters of Francis Galton

At this point Galton recognises two important matters, namely : (i) that these physical characters are in certain cases highly correlated, and that

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accordingly it is scarcely accurate to mark them independently, and (ii) that from the fitness point of view a vital capacity, for example, for a small man may be amply adequate, while the same vital capacity would be insufficient for a big man. If we judged independently by rank for vital capacity and stature, say