Coffee and Tea Compared.
Tea yields, weight for weight, twice as much caffeine (or theine) as coffee; but as we use more in weight of the latter, a cup of coffee contains about as much caffeine as a cup of tea. The composition of roasted coffee and the tea leaf are given as follows, although the proportions are variable:
| Tea. | Coffee. | |
|---|---|---|
| Water | 8 | 5 |
| Theine or caffeine | 2-1/2 | 3/4 |
| Tannin | 14 | 4 |
| Essential oil | 1/2 | Trace. |
| Minor extractives | 15 | 36 |
| Insoluble organic matter | 54-1/2 | 50 |
| Ash | 5-1/2 | 4-1/4 |
| —————— | —————— | |
| 100 | 100 |