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A small glass tube is then introduced through an opening in the shell and membranes of the other end of the egg, and is secured in a vertical position by wax or plaster of Paris, the tube penetrating the yelk. The egg is then placed in a wine-glass partly filled with water. In the course of a few minutes, the water will have penetrated the exposed membrane, and the yelk will rise in the tube."
Nevertheless the student of development finds, not only that the chick commences its existence as an egg, primarily identical, in all essential respects, with that of the Dog, but that the yelk of this egg undergoes division that the primitive groove arises, and that the contiguous parts of the germ are fashioned, by precisely similar methods, into a young chick, which, at one stage of its existence, is so like the nascent Dog, that ordinary inspection would hardly distinguish the two.
Nevertheless the student of development finds, not only that the chick commences its existence as an egg, primarily identical, in all essential respects, with that of the Dog, but that the yelk of this egg undergoes division that the primitive groove arises, and that the contiguous parts of the germ are fashioned, by precisely similar methods, into a young chick, which, at one stage of its existence, is so like the nascent Dog, that ordinary inspection would hardly distinguish the two.
They are of diverse shapes and contents, and perform various different operations. The first formation of every animal is accomplished by the agency of cells, and may be illustrated by the egg of any bird or fowl. In the yelk floats the germ-cell, b, which is the point where the formation of the future animal commences.
Chop or slice cold potatoes; season with pepper and salt; stew them, with a little butter and milk, and a dust of flour; when nearly done, stir in a yelk of egg with some chopped parsley they will cook in a few minutes, and may be sliced over night if you wish an early breakfast. Sweet Potatoes.
Remember to serve up those eggs that are of an oblong make, as being of sweeter flavor and more nutritive than the round ones: for, being tough-shelled, they contain a male yelk. Cabbage that grows in dry lands, is sweeter than that about town: nothing is more insipid than a garden much watered. The mushrooms that grow in meadows, are of the best kind: all others are dangerously trusted.
Certain fatty meats, however, should be generally interdicted, such as pork sausage, smoked beef tongue, goose breast, smoked ham, fat salmon, and herring in any form. Eggs, however, may be partaken of in moderation, giving preference to the albumen over the yelk.
Boil them ten minutes; then cut them in half and take out the seeds, fill them with a stuffing of crumbs of bread, seasoned with butter, pepper, salt, the yelk of an egg, and if you choose, the juice of a tomato; close them and tie each one with a string; put a little water in the dutch-oven, and lay them in with some of the stuffing on the top; let them cook slowly half an hour, basting them with butter; take them out, thicken the gravy, and pour it over them on the dish.
Had the egg, instead of being broken by the cook, been left under the hen for a certain time, the yelk would have passed by infinitesimal gradations through a series of forms ending in the chick; and by similarly infinitesimal gradations would have arisen those functions which end in the chick breaking its shell; and which, when it gets out, show themselves in running about, distinguishing and picking up food, and squeaking if hurt.
The remains of the yelk, which have not yet been applied to the nutrition and growth of the young animal, are contained in a sac attached to the rudimentary intestine, and termed the yelk sac, or 'umbilical vesicle. Two membranous bags, intended to subserve respectively the protection and nutrition of the young creature, have been developed from the skin and from the under and hinder surface of the body; the former, the so-called 'amnion, is a sac filled with fluid, which invests the whole body of the embryo, and plays the part of a sort of water-bed for it; the other, termed the 'allantois, grows out, loaded with blood-vessels, from the ventral region, and eventually applying itself to the walls of the cavity, in which the developing organism is contained, enables these vessels to become the channel by which the stream of nutriment, required to supply the wants of the offspring, is furnished to it by the parent.
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