362 



THE SUN'S GIFT OF LIGHT 



light not only kills disease germs; it also banishes gloom 

 and stimulates cheerfulness. Cheerfulness itself is a genuine 

 health tonic. 



Up to about fifty years ago whale oil and candles furnished 

 the best artificial lights obtainable. It is difficult for us to 

 appreciate how numerous are the advantages and how much 



HOSPITAL WARD 

 Showing the great care taken to secure light, air, and cleanliness. 



greater the power of illumination when kerosene, gasoline, 

 acetylene, illuminating gas, and electricity are used. In 

 many sections of our large cities artificial lighting almost 

 turns night into day. So enormous is the amount of fuel 

 used for the brilliant lighting of our cities that the United 

 States Government was compelled to combine " lightless 

 nights " with " daylight saving " in the interest of fuel 

 economy during the World War. 



