ds to no other whatever. And therefore we assert that such a
course of physiology as is needful for the comprehension of its general
truths and their bearings on daily conduct is an all-essential part of a
rational education."

Believing that the diffusion of knowledge for the prevention of disease
is quite as noble a work as the alleviation of physical suffering by
medical skill, we have devoted a large portion of this volume to the
subjects of physiology and hygiene. These we have endeavored to present
in as familiar a style as possible, that they may be understood by every
reader. Freely as we have received light upon these subjects have we
endeavored to reflect it again, in hopes that a popular presentation of
these matters made plain and easy of comprehension to all people, may
lead the masses into greater enjoyment of life--the result of a better
preservation of health. This we do in part as a public acknowledgment of
our obligations to society, to whom every professional man is a debtor.
He belongs to it, is a part of its common stock, and should give as well
as receive advantages, return as well as accept benefits. We know of no
better way to signify our appreciation of the public confidence and
patronage, so generously accorded to us, than to offer this volume to
the people at a price less than the actual cost for an edition of
ordinary size. This we do as a token of the cordial reciprocation of
their good will. In giving to the people wholesome advice, by which they
may be enabled to ward off disease and thus preserve the health of
multitudes, we believe we shall receive their hearty approval, as well
as the approbation of our own conscience, both of which are certainly
munificent rewards. We believe that good deeds are always rewarded, and
that the physician who prevents sickness manifests a genuine and earnest
devotion to the common interests of humanity.

We have no respect for the motives of those medical men who would
withhold that information from the people which will direct the masses
how to take care of themselves, and thereby prevent much sickness and
suffering. Nor is the diffusion of such knowledge antagonistic to the
best interests of the true and competent physician. The necessity for
his invaluable services can no more be set aside by popularizing
physiological, hygienic, and medical truths, than we can dispense with
those of the minister and lawyer by the inculcation of the principles of
moral