REFERENCES 59 
When possible, the age of first comers from the North should be recorded; 
but the plumage of adult and young are now often alike, and a bird’s age 
can be ascertained with exactness only by dissection, the condition of the 
bones of the cranium furnishing one of the most dependable clues. 
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Pa.and N. J., pp. 15-28.—1895. Bray, R.8., A Remarkable Flight of Birds, 
Nature, LII, p. 45.—1895. Jonzs, L., Bird Migration at Grinnell, Ia., 
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XXII, pp. 372-377.—1905. Cooxs, W. W., Routes of Bird Migration, 
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