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INTENDED AS INTRODUCTORY TO THE LARGER WORK

BY THE SAME AUTHOR.

BY WORTHINGTON HOOKER, M. D.,

TROFESSOR OF THE THEORY AND PRACTICE OF MEDICINE IN YALE OOLLEAL

AUTHOR OF PHYSICIAN AND PATIENT, HUMAN PHYSIOLOGY,” KTO.

ILLUSTRATED BY ENGRAVINGS.

NEW YORK:

SHELDON AND COMPANY; PUBLISHERS,
877 BROADWAY.

1872.

KD 33118

UNIVERSITY

LIBRARY 04668172

ENTERED according to Act of Congress, in the year 1855, by

WORTHINGTON IJOOKER, M. D,
In the Clerk's Office of the District Court of the United States for the

District of Connecticut

COLLEGE AND SCHOOL TEXT-BOOKS

BY

EMINENT PRACTICAL TEACHERS.

BULLIONS' SERIES OF GRAMMARS, ETC.
INTRODUCTION TO ANALYT. AND PRAC. GRAMMAR. 40 cts.
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LATIN LESSONS, by Spencer, 75 cents, introductory to Bullions'
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*LATIN READER. $1 25.

*LATIN EXERCISES. $1 28. CÆSAR. $1 25.

CICERO. $1 25. SALLUST. $1 12. *LATIN ENGLISH DICTIONARY (with Synonyms). $300. GREEK LESSONS. 85 cents.

GREEK GRAMMAR. $1 50. *GREEK READER. $2 00.

*COOPER'S VIRGIL. $2 25.

THE NORMAL MATHEMATICAL SERIES, STODDARD'S JUVENILE MENTAL ARITHMETIC. 22 cents. STODDIRD'S INTELLECTUAL ARITHMETIC. 25 cents. STODDARD'S RUDIMENTS OF ARITHMETIC. 50 cents. STODDARD'S PRACTIAL ARITHMETIC. 70 cents. STODDARD & HENKLES ELEMENTARY ALGEBRA. $1 00. STODDARD & HEVKLE'S UNIVERSITY ALGEBRA. $1 75. *KEY TO S.'S INTELL. AND PRAC. ARITHMETICS. 60 cents. *KEY TO S. & H'S ELEMENTARY ALGEBRA. $1 00. *KEY TO S. & H.'S. UNIVERSITY ALGEBRA. $1 75.

FRENCII AND GERMAN.
KEETELS NEW METHOD OF LEARNING FRENCH. $1 50.
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PHYSIOLOGY, LOGIC, ASTRONOMY, ETC.
HOOKER'S HUMAN PHYSIOLOGY. $1 50. FIRST BOOK. 50 cts.
WHATELY'S ELEM. OF LOGIC. $1 50. RHETORIC. $1 50.
THOMPSOV'S LAWS OF THOUGHT. $1 50.
WAYLAND'S INTELLECTUAL PHILOSOPHY. $1 50.
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Also several other Text Books by good Authors, for which, see our Catalogue, which is furnished gratis. We furnih to Teachers for Examination, postpaid by mail, a copy of any of the above book's not having a * annexed, at half price. Thuse marked with a * we send on receipt of the prices anrexed.

SHELDON & CO.,

Publishers, New York. Manufactured by Case, Lockwood & Co., Ilurtford, Conn.

KARVARD
UNIVERSITY
LIBRARY

PREFACE,

This book is intended for beginners in the study of Physiology, of whatever age they may be. It is a “First Book” for the adult as well as for the child. There is more in common between young and adult minds, in regard to a subject which is new to them, than is commonly supposed. There is for both the same need of simple, clear, and precise statement, with familiar illustration. A book intended to instruct a child in any science should be so written, that it will be just as instructive to an adult unacquainted with the subject. Not only so, but it should be so written, that it will interest and please a mind that has a full knowledge of the subject, by its logical and clear development of simple fun damental facts and principles.

It is a common error to suppose, that there need not to be as logical a presentation of a subject in teaching children as in teaching adults. A correct logic, in the true sense of that word, is necessary in either case. In teaching any science, no matter what the age of the scholar may be, a natural, that is, a logical, arrangement of the facts and principles, is essential to success. Indeed, it is more essential at the outset than it is subsequently, for the beginner lays the very foundations of his knowledge, upon which in his course of learning afterwards he builds up the superstructure. It is the simple facts and principles of science, such as should be taught to the beginner, that are fundarrental. In order that he may begin right, he must acquire a clear idea of these.

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