CONTENTS xi 



PAGE 



XIII. THE FARM. 



Poultry and Eggs 297 



The Horse 304 



Cows, and the Dairy Industry 307 



Lessons on Corn 312 



Apple Raising as an Industry 319 



Wheat, and Wheat Growing . 325 



Origin and Nature of Soils 332 



XIV. PHENOMENA OF LIGHT. 



Shadows and Eclipses 336 



*Images by Reflection in Plane Mirrors 338 



*Color Phenomena , 342 



XV. THE EARTH AS A PLANET. 



Day and Night, and the Earth's Rotation 349 



Rotation Combined With Revolution, and Changes in Seasons 351 



The Moon, and Its Phenomena 355 



Time, and Time-keeping, and Standard Time . . . . . . .359 



XVI. THE HEAVENS 364 



APPENDIX. 



Suggestions to Teachers 370 



Reference Books 372 



* See page 372. 



