TRANSCRIBER'S NOTE Italic text is denoted by _underscores_. Bold text is denoted by =equal signs=. Obvious typographical errors and punctuation errors have been corrected after careful comparison with other occurrences within the text and consultation of external sources. More detail can be found at the end of the book. SCIENCE FOR THE SCHOOL AND FAMILY. PART I. NATURAL PHILOSOPHY. BY WORTHINGTON HOOKER, M.D., PROFESSOR OF THE THEORY AND PRACTICE OF MEDICINE IN YALE COLLEGE, AUTHOR OF "HUMAN PHYSIOLOGY," "CHILD'S BOOK OF NATURE," "NATURAL HISTORY," &C. =Illustrated by nearly 300 Engravings.= NEW YORK: HARPER & BROTHERS, PUBLISHERS, FRANKLIN SQUARE. 1873. By Dr. Worthington Hooker. =The Child's Book of Nature.= For the Use of Families and Schools; intended to aid Mothers and Teachers in training Children in the Observation of Nature. In three Parts. Illustrated by Engravings. The Three Parts complete in one vol. Small 4to, Cloth, $2 00; Separately, Cloth, 90 cents each. PART I. PLANTS. PART II. ANIMALS. PART III. AIR, WATER, HEAT, LIGHT, &c. =First Book in Chemistry.= For the Use of Schools and Families. Illustrated by Engravings. Square 4to, Cloth, 90 cents. =Natural History.= For the Use of Schools and Families. Illustrated by nearly 300 Engravings. 12mo, Cloth, $1 50. =Science for the School and Family.= PART I. NATURAL PHILOSOPHY. Illustrated by nearly 300 Engravings. 12mo, Cloth, $1 50. PART II. CHEMISTRY. Illustrated by numerous Engravings, 12mo, Cloth, $1 50. PART III. MINERALOGY AND GEOLOGY. Illustrated by numerous Engravings. 12mo. Cloth, $1 50. =Published by HARPER & BROTHERS, Franklin Square, N. Y.= Any of the above Works sent to any part of the United States, postage pre-paid, upon receipt of the Price. Entered, according to Act of Congress, in the year one thousand eight hundred and sixty-three, by HARPER & BROTHERS, in the Clerk's Office of the District Court of the Southern District Court of New York. PREFACE.