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Updated: May 17, 2025
Water slightly acidulated with sulphuric, nitric, or muriatic acid will probably be the best, but it is hoped that phosphoric, acetic, and lactic acids will prove equally good. Lemon juice and vinegar are merely acetates and citrates of potash, and are not as good. It seems that the offensive smells noticed in the English Houses of Parliament last session have been traced to their source.
It is this acid which, as we shall see, is produced in the ordinary souring of milk, and a large number of species of bacteria are capable of producing the acid from milk sugar. Any sample of sour milk may therefore always be depended upon to contain plenty of lactic organisms. In its manufacture for commercial purposes milk is sometimes used as a source, but more commonly other substances.
There are many ways of demonstrating this, of which the following is one: Since the results of our experiments have shown that sweetened water, phosphates, and chalk very readily give rise to lactic and butyric fermentations, what reason is there for supposing that if we substitute grains of barley for chalk, the lactic and butyric ferments will spring from those grains, in consequence of a transformation of their cells and albuminous substances?
Here Liebig failed to perceive that the ferment, in its capacity of a living organism, had anything to do with the fermentation. This theory dates back as far as 1843. In 1846 Messrs. Boutron and Fremy, in a Memoir on lactic fermentation, published in the Annales de Chimie et de Physique, strained the conclusions deducible from it to a most unjustifiable extent.
The fortuitous association of different ferments could not invalidate the conclusion that all the nitrogen of the cells of the alcoholic and lactic ferments was derived from the nitrogen in the ammoniacal salts, and that all the carbon of those ferments was taken from the sugar, since, in the medium employed in our experiment, the sugar was the only substance that contained carbon.
Every food we take must be modified by our bodies before entering the circulation, and milk is no exception. When milk is allowed to stand for a while the sugar ferments, through the action of the lactic acid bacteria. The sugar is turned into lactic acid, which combines with the casein and when this process has continued for a certain length of time the result is clabbered milk or sour milk.
Thus vinegar, containing acetic acid, is formed from the fermentation of apple juice, hard cider being an intermediate product. Sweet, chopped, immature field corn becomes sour silage in the silo, lactic, acetic, carbonic and other acids being formed. By a similar process cabbage is turned into sauerkraut. Likewise sweet milk becomes sour, with the formation of lactic acid.
Sir Launcelot got up steam, he and I loaded up the kettle with unslaked lime and carbolic acid, with a touch of lactic acid added thereto, then filled the thing up with water and inserted the steam-spout under the canopy. Everything was ship-shape now, and we sat down on either side of the crib to stand our watch.
On hot days milk and acid fruit make a satisfying meal. Many believe that milk and acid fruit should not be taken in the same meal, because the acid curdles the milk. As we have already seen, the milk must be curdled before it can be digested. If this step in digestion is performed by the acid in the fruit no more harm is done than when it is performed by the lactic acid bacteria.
Displaced semilunar cartilage, and a three months' job. The man's worth thirty-five shillings a week. And there! I'm hanged if the woman with the rheumatic arthritis isn't round in her bath-chair again. She's all sealskin and lactic acid. It's simply sickening to see how they crowd to that man. And such a man! You haven't seen him. All the better for you.
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