food-yolk

Egg: a simple cell, capable of fertilization, containing the germ, the food-yolk necessary for its nutriment, and a covering membrane: a single ovum or cell from an ovary: the first stage of the insect.

Explanation of Terms Used in Entomology John. B. Smith

The most important phenomena to be included under the general heading of cenogenesis are, first, the occurrence of food-yolk, and second, those anomalies of development which are classed by Haeckel as heterochronies and heterotopies.

Form and Function A Contribution to the History of Animal Morphology

In the higher animals a good deal of food-yolk is stored up in the germ, and so the vase-shaped structure has been flattened and altered.

The World's Greatest Books — Volume 15 — Science Various 1909

Among existing marsupial animals, which, on the whole, represent a lower type of mammalian structure than ordinary mammals, there is more food-yolk than in ordinary mammals, and less food-yolk than in the two egg-laying mammals.

Thomas Henry Huxley; A Sketch Of His Life And Work 1904

When this connection (called the placenta) between embryo and mother through the egg-shell became more perfect, not only oxygen but food-material was obtained from the blood-vessels of the mother; and, in consequence, it became unnecessary for the eggs to be provided with a large supply of food-yolk.

Thomas Henry Huxley A Sketch Of His Life And Work Mitchell, P Chalmers 1900

Among existing marsupial animals, which, on the whole, represent a lower type of mammalian structure than ordinary mammals, there is more food-yolk than in ordinary mammals, and less food-yolk than in the two egg-laying mammals.

Thomas Henry Huxley A Sketch Of His Life And Work Mitchell, P Chalmers 1900