...The white of the egg does not coagulate, but the yolk does, and this is the only part eaten... 
David Livingstone 「Missionary Travels and Researches in South Africa」
...the yolk...
Ambrose Blacklock 「A Treatise on Sheep:」
...Softness of the wool is evidently connected with the presence andquality of the yolk...
Robert Jennings 「Sheep, Swine, and Poultry」
...Bad management impairs the pliability of the wool, by arresting thesecretion of the yolk...
Robert Jennings 「Sheep, Swine, and Poultry」
...The yolk and thegerm are enveloped by a very thin membrane...
Robert Jennings 「Sheep, Swine, and Poultry」
...When a yolk is full-grown it drops into the funnel-shaped mouth of theoviduct...
John H. Robinson 「Our Domestic Birds」
...Then the stitches are to be cut, the tow taken out,and the wound dressed with yellow basilicum ointment, or one made withturpentine and yolk of egg, spread on pledgets of tow...
Honoré Bourguignon 「On the cattle plague: or, Contagious typhus in horned cattle. Its history, origin, description, and treatment」
...Then the stitches are to be cut, the towtaken out, and the wound dressed with yellow basiliconointment, or one made with turpentine and yolk of egg,spread on pledgets of tow...
Honoré Bourguignon 「On the cattle plague: or, Contagious typhus in horned cattle. Its history, origin, description, and treatment」
...It is merely food—the animal is thelittle whitish circle seen on the membraneenveloping the yolk...
Various 「Birds Illustrated by Color Photography [February, 1898]」
...Meroistic: ovaries that secrete yolk or vitellaginouscells as well as ova...
John. B. Smith 「Explanation of Terms Used in Entomology」
..." Figure 193 Cshows the yolk transformed into the embryo (g), with the outer layerof blastodermic cells (b)...
Alpheus Spring Packard 「Our Common Insects」
...The butterfly's egg is absolutely and relatively of large size, andcontains a considerable amount of yolk...
Geo. H. Carpenter 「The Life-Story of Insects」
...Remove a part of the white at the top, uncovering a little of the yolk...
J. Henri Fabre Alexander Teixeira de Mattos 「The Life of the Fly」
...Eggs in the yolk plug stage have diameters of 1...
William E. Duellman 「Amphibians and Reptiles of the Rainforests of Southern El Peten, Guatemala」
...The yolk is pale green, and the animal pole is brown...
William E. Duellman 「Amphibians and Reptiles of the Rainforests of Southern El Peten, Guatemala」
...As development ensues, the yolk becomes yellow and the embryo first dark brown and then pale grayish tan...
William E. Duellman 「Amphibians and Reptiles of the Rainforests of Southern El Peten, Guatemala」
...Desire to feed varied inhatchlings of the same brood and seemed not to be correlated withretraction of the yolk sac or retention of the caruncle...
John M. Legler 「Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz」
...A turtle that hatched with a large yolk sac in a natural nest possiblywould benefit, through increased ease of mobility, if the yolk sacruptured...
John M. Legler 「Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz」
...This isthe yellow ball which we commonly call the yolk of the egg...
Ernst Haeckel 「The Evolution of Man」
...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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