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Moreover, its real name is "azotized aliment" because it is the presence of nitrogen or azote in it, which, above all, determines its quality, so that people are in the habit of estimating the nourishing power of our food by the amount of nitrogen it contains. In fact, nitrogen seems to be a substance especially inclined towards everything that has life.
And this element possesses the remarkable power of converting starch into sugar, which is the first step in its digestion. Though many azotized substances in a state of decomposition exert a similar agency, yet it is possessed by ptyalin in a much greater degree. The gastric juice has probably no action on farinaceous substances.
They are azotized, and contain quite a marked amount of nitrogen. Chemically, they consist of carbon 19, hydrogen 10, nitrogen 4, oxygen 4. Some allowance is therefore to be made for them as plastic food. "Good black tea contains of theine from 2.00 to 2.13 per cent. Coffee-leaves contain of theine from 1.15 to 1.25 per cent. Paraguay tea contains of theine from 1.01 to 1.23 per cent.
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