CHAPTER VII 

 THE BREATH OF A BIRD 



]HINK of a mite of a hummingbird shooting 

 .southward mile after mile; his singing wings 

 l)eginning their throl)l)ing in the cool damp ;iir 

 of an Alaskan fall, whirring through the dry heat of des- 

 erts and around the wind-eddied spurs of mountain-ranges, 

 until they hum in the warm atmosphere of Mexico or 

 Brazil, where tiny insects are never lacking throughout 

 the winter! How exquisite an adjustment must exist 

 in his organs; how mankind's engin(\s of locomotion are 

 put to shame! The only comparison of which we can 

 think is with an insect, —a sphinx-moth or a beetle, whose 

 wings of gauze lift and carry their owners so easily, so 

 steadily. It will l)e interesting to keep this similarit}' 

 in mind, superficial though it is. 



Birds require, comparatively, a vastly greater strength 

 and ''wind" in traversing sucli a thin, unsupporting 

 medium as air than animals ueed for terrestrial locomo- 

 tion. Even more wonderful than mere flight is the ]wr- 

 formance of a bird when it springs from the gi'ound, and 

 goes circling upward higher and higher on rapidly beating 

 wings, all the while pouring forth a continuous series of 



musical notes, the strength of the utterance of which 



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