Fowl Ovum

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“Meroblastic ovum (yelk) of domestic fowl, bat. size, in section; after haeckel. a, the thin yelk-skin, enclosing the yellowfood-yelk, which is deposited in concentric layers, c, d; b, the cicatricle or tread with its nuclues, whence passes a cord of white yelk (here represented in black) to the central cavity, d’” Elliot Coues, 1884


Bird Anatomy


Elliot Coues Key to North American Birds (Boston, MA: Estes and Lauriat, 1884)


TIFF (full resolution)

2400×2365, 674.1 KiB

Large GIF

1024×1009, 104.3 KiB

Medium GIF

640×630, 59.1 KiB

Small GIF

320×315, 23.8 KiB