Theine

Definition and stakes

Portrait of Albert Benjamin Prescott Albert Benjamin Prescott,  Popular Science Monthly (1882)

“ In chemical analysis coffee yields an alkaloid, at first named caffeine, but long since determined to be identical with the alkaloid of the tea-plant, so that while the terms theine and caffeine are both in use, chemists recognize them as synonyms. Theine is found not only in the seed—the "berry" of the coffee-plant but even more abundantly in the leaf, though the latter, of less agreeable flavor, has been little used, and is not in commerce. The use of the coffee-leaf is further discouraged by the fact that the plucking of the leaf is injurious to the crop of the berry. ”
Source: Wikisource

Joseph M. Walsh,  Tea, its history and mystery (1892)

“ Theine—Is the alkaloid of tea and is the substance to which it owes its refreshing and stimulating properties. It is a crystallizable matter, soluble in water, very bitter to the taste and characteristic alike of both tea and coffee, being to these beverages what quinine is to bark, and with the base of cocoa which has recently received the name of “theobromine,” it is also closely related. ”
Source: Gutenberg

Portrait of Alfred Tennyson Alfred Tennyson,  Poems (1833)

“ Flashed thro' her as she sat alone,
Yet not the less held she her solemn mirth,
And intellectual throne
LVI.
Of fullsphered contemplation. So three years
She throve, but on the fourth she fell,
Like Herod, when the shout was in his ears,
Struck thro' with pangs of hell.
LVII.
Lest she should fail and perish utterly,
God, before whom ever lie bare
The abysmal deeps of Personality,
Plagued her with sore despair.
LVIII.
When she would think, wheree'er she turned her sight
The airy hand confusion wrought,
Wrote "Mene, mene," and divided quite
The kingdom of her thought.
”
Source: Wikisource

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