...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 of one young piscivorus was 11...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Egg of Star-fish in which the yolk has been divided into two segments...
Elizabeth Cabot Cary Agassiz 「Seaside Studies in Natural History」
...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 abundance of the yolk enables thewool to detain all the filth which comes in contact with it, so muchso, that by washing the weight is diminished about three-fifths...
Ambrose Blacklock 「A Treatise on Sheep:」
...The finer the wool, the more abundant is the yolk orviscid secretion on the skin, and the greater, consequently, is thequantity of filth which sticks to it...
Ambrose Blacklock 「A Treatise on Sheep:」
...The growth ofthe yolk ought to be promoted, and agriculturists ought to pay moreattention to the quantity and quality of yolk possessed by the animalsselected for the purpose of breeding...
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」
...When a yolk is full-grown it drops into the funnel-shaped mouth of theoviduct...
John H. Robinson 「Our Domestic Birds」
...Meroistic: ovaries that secrete yolk or vitellaginouscells as well as ova...
John. B. Smith 「Explanation of Terms Used in Entomology」
...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」
...I carried him indoors, and "mothered" the littlehelpless thing as well as I could, by feeding himwith hard-boiled yolk of egg mixed with brownbread and water...
Elizabeth Brightwen 「Wild Nature Won By Kindness」
...Brush with the beaten yolk of egg, milk or cream andbake one half hour...
Various 「Armour's Monthly Cook Book, Volume 2, No. 12, October 1913」
...Previously colours had been mixedin water with some gelatinous substance, suchas the white and yolk of an egg, to give thepaint a proper texture or consistency...
Dolores Bacon 「Pictures Every Child Should Know」
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