74 



TYRANT FLYCATCHER. 



no means uncommon among the various tribes that inhabit the 

 United States. The Sparrow Hawk, Sparrow, Robin, Red-wing^ 

 ed Blackbird, and many others, are occasionally found in white 

 plumage; and I believe that such birds do not become so by 

 climate, age or disease, but that they are universally hatched so. 

 The same phenomena are observable not only among various sorts 

 of animals, but even among the human race ; and a white negro 

 is no less common, in proportion to their numbers, than a white 

 Blackbird; tho the precise cause of this in either is but little un- 

 derstood. 



