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Updated: June 12, 2025
Besides sugar, which is present in this sap to the extent of 616 grains nearly an ounce and a half per gallon, there are present a mere trace of mucilage; no starch; no tannin; 31/2 grains per gallon of ammoniacal salts yielding 10 per cent. of nitrogen; 3 grains of albuminoid matter yielding 10 per cent. of nitrogen; a distinct trace of nitrites; 7.4 grains of nitrates containing 17 per cent. of nitrogen; no chlorides, or the merest trace; no sulphates; no sodium salts; a little of potassium salts; much phosphate and organic salts of calcium; and some similar magnesian compounds.
I require them to precipitate the tannin in my tea," he remarked to the room at large, and folding his hands, remained for some time with his chin thereon, staring fixedly at a little picture over Mr. Hoopdriver's head. "I myself am a cyclist," said the clergyman, descending suddenly upon Mr. Hoopdriver. "Indeed!" said Mr. Hoopdriver, attacking the moustache. "What machine, may I ask?"
Sunny mountain slopes of a medium height yield, according to wide experience, on an average the pine-barks richest in tannin. In woods in level districts the proportion of tannin is greatest in localities exposed to the light, while darkness seems to have an unfavorable effect.
As for the Trackless, or Susquesus, as he was commonly called, his temperance throughout a long life did him good service, and his half-naked limbs and skeleton-like body, for he wore the summer dress of his people, appeared to be made of a leather long steeped in a tannin of the purest quality.
This can be prevented in a great measure, says Elizabeth Robinson Scovil, in Ladies' Home Journal, if not entirely, by bathing the nipples twice a day for six weeks before the confinement with powdered alum dissolved in alcohol; or salt dissolved in brandy. If there is any symptom of the skin cracking when the child begins; to nurse, they should be painted with a mixture of tannin and glycerine.
Men and boys were engaged in plucking the leaves and conveying them, in mat-bags suspended on each end of a bamboo staff, to the boiling-ground. Here they were boiled until the water was evaporated, and the inspissated juice deposited, which we afterward saw drying in little squares. It is a powerful astringent, having one-tenth more tannin than any other substance known.
The time of fermentation must vary, of course, with the state of the atmosphere; in cooler weather, both pressings should remain longer on the husks. The results, in both varieties were wines of excellent flavor, good body, a brilliant color, with enough of tannin or astringency, and sufficient acid therefore, in every way satisfactory.
The operation of tanning leather consists in exposing a hide to the action of a chemical ingredient, called tannin, for a length of time sufficient to allow every particle of the hide to become saturated with the solution.
Chemists find in manufacturing tea leaves three principal constituents to which all the physiological effects of tea are attributed. These are, Theine, Essential or Volatile Oils, Tannin. Theine is present in the green leaf of tea, and is apparently unchanged in the manufactured leaf and in the infusion or beverage.
Rice and plaintain are in fact the staple food of the natives. Cotton and maize are also raised to a certain extent. There should in the future be an industry from the manufacture of tannin extracts from the bark of Coccolala, Rhizophora and the pods of various acacias, the latter of which are a great nuisance on account of their rapid growth.
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