[Darwinism (1889) by Alfred Russel Wallace]@TWC D-Link bookDarwinism (1889)
CHAPTER III
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Numbers bracketed imply that the corresponding feathers were of equal length.[20] RELATIVE LENGTHS OF PRIMARY WING FEATHERS OF DENDROECA CORONATA.
-- -------+-----------+----------+-----------+----------+---------- Longest.
| Second in | Third in | Fourth in | Fifth in | Sixth in | Length.
| Length.
| Length.
| Length.
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