Smithsonian miscellaneous collections . 21. A secondary quill with hook and curved fibers of Coluiiiha livia Magnified i:6o 22. Hook-fibers of a secondary quill of Colnmba livia. Magnified i:iio 23. Surface view of the upper side of a hand-reme.\ of Cygmis olor, showing the terminal parts of thehook-fibers. Magnified 1:270 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. ts, PL. XII.

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Keywords: ., bookauthorsm, bookcentury1800, bookdecade1860, booksubjectscience