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Of this water the largest part is contained in the white, which is almost pure albumen, each particle of albumen being enclosed in very thin-walled cells; it is the breaking of these cells and the admission of air that enables one to beat the white of egg to a stiff froth. The fat is accumulated in the yolk, often amounting to thirty per cent.
If you like nitrogen, go and get a druggist to give you a canful of it at the soda counter, and let you sip it with a straw. Only don't think that you can mix all these things up with your food. There isn't any nitrogen or phosphorus or albumen in ordinary things to eat. In any decent household all that sort of stuff is washed out in the kitchen sink before the food is put on the table.
After a spell of some hours, it has disappeared within a solid shell. This is white as snow and highly porous; it might almost be a globule of whipped albumen. Thus, to stick together the sand in its pill-shaped nest, the larva employs a frothy albuminous substance. Let us now dissect the builder. Around the oesophagus, which is fairly long and soft, are no salivary glands, no silk-tubes.
When exposed to a temperature varying from sixty to seventy-five degrees of heat, according to the quantity of water with which it is mixed, albumen hardens, and changes from a colorless transparent liquid, into that opaque white substance, which everybody who has eaten "hard-boiled eggs" is perfectly well acquainted with.
Precisely what Rumford did; she whips her albumen to obtain a soufflée, a froth composed of myriads of tiny air-bubbles, which will protect the germs of life contained in the central core.
As the growth of the young fish increases the albumen decreases, being incorporated into the members of the young fish, and it disappears entirely when development and formation are complete. The beating of the heart ... is conveyed to the lower part of the belly, carrying pulse and life to the inferior members.
The juice has been since examined by Vauquelin, and this celebrated chemist has very clearly recognized the albumen and caseous matter; he compares the milky sap to a substance strongly animalized to the blood of animals; but his researches were confined to a fermented juice and a coagulum of a fetid smell, formed during the passage from the Mauritius to France.
Of this, albumen furnishes seventy, and the ten others, with the exception of a small portion of fat which floats here and there ready-made, are salts. It would take too long to explain what salts are here, but there is one sort of salt you know perfectly well; viz., that which is put on the dinner-table in a salt-cellar. And it is the most important of all.
What is it that makes common salt crystallize in the form of cubes, and saltpetre in the shape of six-sided prisms? We see no reason why it should not have been just the other way, salt in prisms and saltpetre in cubes, or why either should take an exact geometrical outline, any more than coagulating albumen.
Dissolve a few drops of oil or fat in a teaspoonful of ether. Let a drop of the solution fall on a piece of tissue or rice paper. Experiment 83. Pour a little cod-liver oil into a test tube; add a few drops of a dilute solution of sodium carbonate. The whole mass becomes white, making an emulsion. Experiment 84. Shake up olive oil with a solution of albumen in a test tube.
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