of vanity to that bare appreciation of self which makes life tolerable. The lesson of the review I have attempted should be that the safe and desirable development of self-consciousness in respect to capacity, merit, and worth, is that which neither depreciates too much for self-respect and confidence, nor inflates the mind with an overweening sense of being somebody; perhaps on no more solid ground than the accident of having done something which could not be repeated, or achieved a position which cannot be retained.

6. Consistency, as I have endeavoured to convince the reader, is a quality of the character which must be wholly natural to be of value, and can never be made an object.

7. Simplicity of aim and single-mindedness in conduct and policy are among the chief indications of clearness in head-work. To do one thing at a time, and that thoroughly, is a most important element of the secret we are trying to master.

Simplicity, or single-mindedness, implies and comprises integrity of purpose, thoroughness, directness of aim, earnestness, and individuality—which are the cardinal elements of "clearness" as applied to brain or head work.

To apply the principles I have endeavoured to expound is to do all man can do to ensure that

greatest of personal qualifications for a useful and happy life, a sound and clear head. The motives and guiding considerations which should inspire and control the effort to attain this boon compose the secret I have tried to help the reader to find.

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INDEX OF SUBJECTS.