XI. NECESSITY FOR PURE AIR AND HOW TO SECURE IT 45 XII. REST ESSENTIAL TO HEALTH 51 XIII. CARE OF THE EYE AND EAR 56 XIV. CARE OF THE SKIN 60 XV. COMMON POISONS TO BE AVOIDED 64 PART II--THE ENEMIES OF HEALTH XVI. DISEASE GERMS 73 XVII. ENCOURAGEMENT OF DISEASE BY UNCLEANLY HABITS 75 XVIII. FLIES AS CARRIERS OF DISEASE 79 XIX. HOW DISEASE GERMS GET INTO WATER 85 XX. TRANSMISSION OF DISEASE THROUGH THE AIR 89 XXI. INSECTS AS CARRIERS OF DISEASE 92 XXII. HOW TO KEEP GERMS OUT OF WOUNDS 95 XXIII. TRANSMISSION OF DIPHTHERIA 100 XXIV. THE CURE OF DIPHTHERIA 108 XXV. HOW TYPHOID FEVER GERMS ARE CARRIED 113 XXVI. HOOKWORM DISEASE AND AMOEBIC DYSENTERY 120 XXVII. HOW SCARLET FEVER IS CARRIED 123 XXVIII. MEASLES AND WHOOPING COUGH DANGEROUS DISEASES 128 XXIX. HOW SMALLPOX IS PREVENTED 131 XXX. WHY VACCINATION SOMETIMES SEEMS A FAILURE 138 XXXI. CONSUMPTION, THE GREAT WHITE PLAGUE 142 XXXII. HOW CONSUMPTION IS SPREAD AND HOW PREVENTED 150 XXXIII. HOW CONSUMPTION IS CURED 157 APPENDIX--SUMMARY OF ANATOMY 163 SUGGESTIONS TO THE TEACHER 182 INDEX 183 PART I THE FIGHT FOR HEALTH CHAPTER I CONSTANT DANGER OF ILLNESS Every boy and girl confidently expects to grow into a strong and healthy man or woman. How often we hear a child say, "When I am a man," or "When I am a woman;" but I have never heard a boy or a girl say, "If I live to be a man or woman." When you think of what you will do when you are grown into men or women, it never occurs to you that you may be weak and sickly and therefore not able to do the very things that you would most like to do. This suggests that sickness is not natural, else the thought that you may perhaps become sick would enter your mind. As a matter of fact, most sickness is not natural. [Sidenote: The fight for life] There is a constant struggle going on in the world. You see a fight about you every day among the animals. You see the spider catch the fly, the snake catch the frog, the bird catch the insect, and the big fish catch the minnow; and you have heard of wars where men kill one another.