... Yolk is used up in about two weeks if its rate of utilization resembles that of the copperhead as reported by Gloyd (1934:600)... 
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...In eggsin the yolk plug stage of development, the diameter of the embryo is about2...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...Flux is cured by the yolk of an egg boiled hard; andboiled barley soaked in wine...
Richard L. Allen 「Domestic Animals」
...In Cochins and Game-fowls there is some relation between the colour of the plumage and the darkness of the egg-shell and even of the yolk...
Charles Darwin 「The Variation of Animals and Plants Under Domestication, Vol. I.」
...the yolk...
Ambrose Blacklock 「A Treatise on Sheep:」
...The yolk has an insipid, bland, oily taste; and, when agitated withwater, forms a milky emulsion...
Robert Jennings 「Sheep, Swine, and Poultry」
...Any kind of rough motion, indeed, rupturesthe membranes which keep the white, the yolk, and the germ of thechicken in their appropriate places; and, upon these being mixed,putrefaction is promoted...
Robert Jennings 「Sheep, Swine, and Poultry」
...It will then generally be found that the whole fluidcontents of the egg, yolk and all, are taken up into the body of thechicken, and that weakness alone has prevented its forcing itself out...
Robert Jennings 「Sheep, Swine, and Poultry」
...Thisresembles the yolk of a stale egg, and clings to the feathers near thevent...
Robert Jennings 「Sheep, Swine, and Poultry」
...These yolks are not germs, but as they grow thegerm forms on one side of each yolk, where it appears as a small whitespot...
John H. Robinson 「Our Domestic Birds」
...When a yolk is full-grown it drops into the funnel-shaped mouth of theoviduct...
John H. Robinson 「Our Domestic Birds」
...There is a moderate amount of yolk, but this does not form a large ventral bulge...
William E. Duellman 「Amphibians and Reptiles of the Rainforests of Southern El Peten, Guatemala」
...Subsequentretraction or rupture of the yolk sac and closure of the navelare accompanied by a decrease in height of shell and slight, furtherwidening of the carapace...
John M. Legler 「Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz」
...The yolk sac retracts mainly between the time when the eggshell is first punctured and the time when the turtle actually emergesfrom the shell...
John M. Legler 「Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz」
...The spaces between the oval marks were covered with white down and feathers, stuck on with the yolk of a turtle's egg, as I judged by the gluten and by the shell lying near the place...
Matthew Flinders 「A Voyage to Terra Australis Volume 2」
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