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FOREWORD TO TEACHERS

A CIVIC BIOLOGY

I. THE GENERAL PROBLEM—SOME REASONS FOR THE STUDY OF BIOLOGY

II. THE ENVIRONMENT OF PLANTS AND ANIMALS

III. THE INTERRELATIONS OF PLANTS AND ANIMALS

IV. THE FUNCTIONS AND COMPOSITION OF LIVING THINGS

V. PLANT GROWTH AND NUTRITION. CAUSES OF GROWTH

VI. THE ORGANS OF NUTRITION IN PLANTS—THE SOIL AND ITS RELATION TO THE ROOTS

VII. PLANT GROWTH AND NUTRITION—PLANTS MAKE FOOD

VIII. PLANT GROWTH AND NUTRITION—THE CIRCULATION AND FINAL USES OF FOOD BY PLANTS

IX. OUR FORESTS, THEIR USES AND THE NECESSITY FOR THEIR PROTECTION

X. THE ECONOMIC RELATION OF GREEN PLANTS TO MAN

XI. PLANTS WITHOUT CHLOROPHYLL IN THEIR RELATION TO MAN

XII. THE RELATIONS OF PLANTS TO ANIMALS

XIII. SINGLE-CELLED ANIMALS CONSIDERED AS ORGANISMS

XIV. DIVISION OF LABOR. THE VARIOUS FORMS OF PLANTS AND ANIMALS

XV. THE ECONOMIC IMPORTANCE OF ANIMALS

XVI. THE FISH AND FROG, AN INTRODUCTORY STUDY OF VERTEBRATES

XVII. HEREDITY, VARIATION, PLANT AND ANIMAL BREEDING

XVIII. THE HUMAN MACHINE AND ITS NEEDS

XIX. FOODS AND DIETARIES

XX. DIGESTION AND ABSORPTION

XXI. THE BLOOD AND ITS CIRCULATION

XXII. RESPIRATION AND EXCRETION

XXIII. BODY CONTROL AND HABIT FORMATION

XXIV. MAN'S IMPROVEMENT OF HIS ENVIRONMENT

XXV. SOME GREAT NAMES IN BIOLOGY

APPENDIX

WEIGHTS, MEASURES, AND TEMPERATURES

INDEX