192 The Migration of Birds 



bird migration. As you study the subject from year 

 to year, and carefully ■ compare your notes, you will 

 find • the' movement a very constant and regular one, 

 and, as time goes on, your interest in it will increase 

 rather than diminish, and you will find yourself 

 wondering- why it is that each spring you greet the 

 bluebird and- the oriole wi h a little deeper feeling. 



