CONTENTS. 



fRAPTKK FO1 



i. THE HEAT OF THE SUN -., . 1 



n. EXPENDITURE AND SUPPLY . . . .15 



in. How THE HEAT is KEPT UP . . . .26 



iv. WHAT WE OWE TO THE SUN . . . .40 



v. THE CONSTANT FACE or THE MOON . ^. . 49 

 vi. THE MOON'S HISTORY ..... 63 



vii. THE LUNAR WORLD ..... 77 



vin. A VISIT TO AN OBSERVATORY . . .97 



ix. AN EVENING WITH THE TELESCOPE , . .113 

 x. NOTES ON NEBULA . . . . . .124 



xi. VENUS AND MERCURY . . 141 



xn. MARS AS A WORLD . , . . .149 



xni. THE GREATEST PLANET 180 



xrv. THE NAMES or THE PLANETS . . . ,195 

 xv. A FALLING STAR 202 



