CONTENTS 



CHATTER PACK 



I. INTRODUCTION i 



II. SOME RELATIONS BETWEEN WATER AND LIGHT 8 



III. THE DISTRIBUTION OF WATER 16 



IV. EFFECTS OF THE MOVEMENTS OF WATER . 24 

 V. SOLUTION 40 



VI. MAN'S SUPPLY OF WATER. THE INSIDE OF 



THE EARTH 46 



VII. THE SUCTION-PUMP. ATMOSPHERIC PRESSURE 55 



VIII. ARCHIMEDES' PRINCIPLE. WATER-PRESSURE 



AND WATER-WORKS 63 



DC. WATER-POWER AND STEAM-POWER ... 70 



X. WATER AND AGRICULTURE 79 



XI. ORIGIN OF SOIL 86 



XII. KINDS OF SOIL 94 



XIII. FERTILITY AND SOIL LIFE: BACTERIA . . 101 



XIV. MECHANICAL WORK: SIMPLE MACHINES . . 109 

 XV. WORK AND ENERGY: GRAVITATION . . . 117 



XVI. INTRODUCTORY AS TO HEAT: DISCOVERY OF 



FIRE 123 



XVII. MEASUREMENTS OF HEAT 128 



XVIII. HEAT AND COLD 135 



v 



