240 UNDER THE OPEN SKY 



work. The hard enamel covers only the 

 front, while the more yielding ivory forms 

 the rear of the tooth. This softer back 

 keeps wearing away rapidly, leaving the 

 sharp edge of the enamel to do the cutting. 

 If you cage a squirrel and keep him on soft 

 food, it will be but a comparatively short 

 time before his front teeth are far too long 

 for his comfort. 



But while all these delights are engaging 

 our attention we have forgotten that the 

 days are not now so long as they were and 

 that the sun is low down in the southwest. 



SUNSET 



There is a popular notion that the sun 

 rises in the east and sets in the west. That 

 we think so only shows how willing we are 

 to believe what we are told in spite of our 

 eyes. The truth is, there are only two days 

 in the whole year when the sun does any 

 such thing. These two days are March 

 twentieth and September twenty-second, 

 when the days and the nights are each 

 twelve hours long. 



