SIRS,--Having paid some attention to t h e manner in which t h e face of t h e Rook becomes bare, I m a y state t h a t in t h e main m y observations a n d specimens confirm Mr. Witherby's conclusions. But, with regard to this species n o t breeding in t h e first year, there is evidence t h a t this is n o t invariably t h e case. I dissected t h e bird referred t o in Vol. IV., p. 370, as " undou...

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