The necessity for the use of technical expressions in a book written
expressly for the laity must always be a matter of regret. And only
those who have attempted to write a similar work can fully appreciate
the truth of Herbert Spencer's remark, that "Nothing is so difficult
as to write an elementary book on scientific subjects."

The author has added to this edition a section on "The Hygiene of
Puberty," one on "Hemorrhage at the Menopause a Significant Symptom of
Cancer," and one on "The Hygiene of the Menopause."

ANNA M. GALBRAITH.

15 WEST NINETY-FIRST STREET, NEW YORK.
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PREFACE.
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"Ignorance is the curse of God;
Knowledge, the wings wherewith we fly to heaven."

-- "Henry VI."

PERFECT health is essential to perfect happiness. The greater the
knowledge of the laws of nature, and the more closely these laws are
lived up to, so much nearer "ideal" will be the health and happiness
of the individual. Hence the necessity that these same laws should be
as familiar to the adult man and woman as the alphabet. Further, with
our present knowledge of the certain suffering, disease, and death
that are bred by ignorance of all these subjects, it is little less