Nourishment.––Again, the brain cannot do its work well unless it be abundantly and suitably nourished; somebody has made a calculation of how many ounces of brain went to the production of such a work––say Paradise Lost––how many to such another, and so on. Without going into mental arithmetic of this nature, we may say with safety that every sort of intellectual activity wastes the tissues of the brain; a network of vessels supplies an enormous quantity of blood to the organ, to make up for this waste of material; and the vigour and health of the brain depend upon the quality and quantity of this blood-supply.
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