...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」
...A good-sized egg will weigh 1,000 grains, ofwhich about 107 are shell, 604 are white, and 289 are yolk...
Richard L. Allen 「Domestic Animals」
...The yolk and thegerm are enveloped by a very thin membrane...
Robert Jennings 「Sheep, Swine, and Poultry」
...The yolk has an insipid, bland, oily taste; and, when agitated withwater, forms a milky emulsion...
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」
...It is merely food—the animal is thelittle whitish circle seen on the membraneenveloping the yolk...
Various 「Birds Illustrated by Color Photography [February, 1898]」
...Deutoplasm: the yolk or food plasm of an ovum...
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」
...And so the people of my part, struck by the resemblance, call this mushroom lou rousset d'iou, or, in other words, yolk of egg...
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」
...In a clutch in which the eggs are in yolk plug stage the average diameter of the embryos is 2...
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 sac broke two dayslater, smearing the bottom of the turtle's dish with semifluid yolk...
John M. Legler 「Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz」
...Autopsy revealed a vestigeof the retracted yolk sac, approximately one millimeter in diameter,on the small intestine...
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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