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EXTRACT FROM PROSPECTUS.
No scientific subject can be so important to Man as that of his own Life.

No knowledge can be so incessantly appealed to by the incidents of every day, as the knowledge of the processes by which he lives and acts.

At every moment he is in danger of disobeying laws which, when disobeyed, may bring years of suffering, decline of powers, premature decay.

Sanitary reformers preach in vain, because they preach to a public which does not understand the laws of life--laws as rigorous as those of Gravitation or Motion.
Even the sad experience of others yields us no lessons, unless we understand the principles involved.

If one Man is seen to suffer from vitiated air, another is seen to endure it without apparent harm; a third concludes that "it is all chance," and trusts to that chance.