By C. LESLIE THOMSON.

Of all the seemingly minor ailments one may suffer -­‐ things scarcely painful or crippling enough to rate as “real diseases” -­‐ a feeling of being not quite clear-­‐headed is one of the worst. In different people, it takes varying forms: in some, it shows mainly as poor memory; in others a difficulty in finding the right word; still others may have occasional spells of feeling slightly “unreal ” or, and this is the most usual complaint, there may be a vague and generalised sensation of cotton-­‐woolliness which makes the head feel thick and the senses dulled.

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