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 wih a little deeper feeling. 
