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This digestibility depends partly upon the nature of the food in its raw state, partly upon the effect produced upon it by cooking, and to some extent upon its admixture with other foods. Certain foods, as the vegetable albumens, are both nutritious and digestible. A hard-working man may grow strong and maintain vigorous health on most of them, even if deprived of animal food.
It is interesting to peruse, in our Memoir of 1860, certain facts of the same kind relating to fermentation by means of albumens that of the blood for example, from which, we may mention incidentally, we were led to infer the existence of several distinct albumens in the serum, a conclusion which, since then, has been confirmed by various observers, notably by M. Bechamp.
"No, the doctor both doctors have told me that. I can eat starches, and albumens, all right, but I have to keep right away from all carbons and nitrogens. I've been dieting that way for two years, except that now and again I take a little glucose or phosphates." "That must be a nice change," I said, cheerfully. "It is," he answered in a grateful sort of tone. There was a pause.
The growth of bacteria during the ripening produces chemical changes of a somewhat complicated character, and concerns each of the ingredients of the milk. The lactic-acid organisms affect the milk sugar and produce lactic acid; others act upon the fat, producing slight changes therein; while others act upon the casein and the albumens of the milk.
From this tissue activity, which is mainly oxidation, are formed certain waste products which, as we have seen, are absorbed by the capillaries and lymphatics and carried into the venous circulation. In their passage through the blood and tissues, the albumens, sugars, starches, and fats are converted into carbon dioxid, water, and urea, or some closely allied body.
There was the old glass still, with my notes on the albumens stuck in the corner of the frame, my old everyday suit of clothes pitched about the floor. And yet it was not so real after all. I felt an idiotic persuasion trying to creep into my mind, as it were, that I was in a railway carriage in a train just stopping, that I was peering out of the window at some unknown station.
Now when protoplasm had been discovered as the "physical basis of life," and, when it was further conceived that this substance is a proteid related to albumens, it was inevitable that a theory should arise which found the explanation of life in accordance with simple chemical laws.
While it is true that the vegetable albumens furnish all that is really needed for the bodily health, animal food of some kind is an economical and useful addition to the diet. Races of men who endure prolonged physical exertion have discovered for themselves, without the teaching of science, the great value of meat. Hence the common custom of eating meat with bread and vegetables is a sound one.
The microscope had, at that time, just disclosed the universal presence in living things of that wonderful substance, protoplasm. This material appeared to be a homogeneous substance, and a chemical study showed it to be made of chemical elements united in such a way as to show close relation to albumens.
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