Caffeine, caffein n. (Chem.) A white, bitter, crystallizable substance, found in coffee and tea. It is identical with the alkaloid theine from tea leaves, and with guaranine from guarana. It is responsible for most of the stimulating effect of coffee or tea.
... thirty. A bush is usually cut back every ten years or so. A good deal depends on the pruning. After each picking the bushes are cut over with the shears just as we trim box. These trimmings may be used to make an inferior tea for farmhouse consumption, or they may be utilised in the manufacture of caffeine or theine—the two products are indistinguishable. Usually the bushes are cut round-topped, but occasionally they are roof-shaped and sometimes they are like giant ... — The Foundations of Japan • J.W. Robertson Scott
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