NATURAL WONDERS I How the Chicken Gets Inside the Egg II Some Other Sorts of Eggs III Little Fishes In The Brook IV Of Plants’ Eggs V What Little Boys and Girls are Made Of VI More About Living Bricks VII How Much of Us Is Alive VIII How We Grow IX How We Grow Up X How We Grow Old XI Why We Grow At All XII Things That Do Not Have To Be Learned XIII Why We Like Certain Things XIV Animals’ Games XV Some Instincts of Chicks and Kittens XVI Certain Stupidities of Animals XVII How We Differ From The Animals XVIII Something More About Speech and Thinking XIX Why Most Of Us Are Right-Handed XX Where We Do Our Thinking XXI Where Some Of The Animals Do Their Thinking XXII What Plants Know XXIII What Plants Can Do XXIV Some Plant-Like Doings Of Animals XXV The Five Senses and The Other Five XXVI Eyes XXVII Seeing and Believing XXVIII Some Other Senses XXIX The Sight and Hearing Of Ants XXX Ants’ Noses XXXI Some Other Eyes and Ears XXXII Having Senses and Using Them XXXIII Seeing In The Mind’s Eye XXXIV Ear Minds and Others XXXV Living Automobiles XXXVI Air and Fuel XXXVII Men In Glass Boxes XXXVIII Of Sugar and Other Poisons XXXIX Snake Venoms and Others XL Of Measles and Rusty Nails XLI The Great War XLII More About The Great War XLIII Living Apothecary Shops XLIV What Becomes Of The Tadpole’s Tail XLV Nature’s Repair Shop XLVI Little Monsters XLVII How The Animals Keep Their Tools Sharp XLVIII Why The Blood Is Salt XLIX Horses’ Fingers L How The Elephant Got His Trunk LI Something Nobody Understands THE FULL PROJECT GUTENBERG LICENSE