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While nitrogenized bodies are present, however, in the atmosphere, or in the humid artificial heaps of saltpetre plantations, the action of ozonized oxygen is on these, and the nitrous compounds formed unite with the bases lime, soda, and potash, also present, to form saltpetre.
Cheese, on the contrary, is rich in nitrogen. Food which contains much fatty matter, or substances which in the animal system are readily converted into fat, will tend to increase the proportion of cream in milk. On the other hand, the proportion of caseine or cheesy matter in milk is increased by the use of highly nitrogenized food.
"In the first series of experiments, the daily allowance of food, though less copious on the tea days, was more nitrogenized, and nitrogen also was taken in as theine. Yet, in spite of this, the quantity thrown off in twenty-four hours was nearly a gramme less than on the water days.
But the herb under consideration contains a relatively larger proportion of inorganic salts, as those of lime, potassa, and ammonia, and especially of highly nitrogenized substances; which explains why tobacco is so exhausting a crop to the soil, and why ashes are among its best fertilizers.
Due attention should, therefore, be paid by the feeder to the selection of food which contains all the kinds of matter required, nitrogenized as well as non-nitrogenized, and mineral substances; and these should be mixed together in the proportion which experience points out as best for the different kinds of animals, or the particular purpose for which they are kept.
Finally, there are even certain species that die in the presence of free oxygen, and that can only live by protecting themselves from contact with this gas through a sort of jelly. These are ferments, such as Bacillus amylobacter, or butyric ferment, and B. septicus, or ferment of the putrefaction of nitrogenized substances.
This ozonized oxygen, when brought into mixture with many nitrogenized bodies, forms with them nitrous acids, completely destroying their former condition and composition; hence, in the atmosphere, this part of the oxygen becomes a purifier of the whole mass, from which it removes putrescent exhalations, miasmatic vapors, and the effluvia from every source of sea or land.
The cup of tea, which is the sole luxury of their scanty meal, lessens the need for more solid food; it satisfies the stomach, while it gladdens the heart. It saves them, too, the waste of those nitrogenized articles of food which require so much labor and forethought to procure.
The chief results of the inquiry are as follows: The pericarp of the fruit of oats contains a substance soluble in alcohol and capable of exciting the motor cells of the nervous system. It is a nitrogenized matter which seems to belong to the group of alkaloids; is uncrystallizable, finely granular, and brown in mass. The author calls it "avenine."
To explain how the constant waste of these substances may be supplied, a celebrated chemist observes that the albumen, gluten, caseine, and other nitrogenized principles of food, supply the animal with the materials requisite for the formation of muscle and cartilage; they are, therefore, called flesh-forming principles.
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