Chemical investigation indicates that caffeine and theine are the same and theobromine is a closely related substance.
It contains the same active principle, theine as tea and coffee, but not their volatile and empyreumatic oils.
Coffee contains caffein, a principle identical with theine and a modified form of tannin, though in less quantity than tea.
Dr Walter Blyth, commenting upon the above, says, the amount of theine is certainly understated.
theine, by being a restorative and an indirect sustainer and regulator of the circulation, may induce sleep.
theine is a poison belonging to the same class of poisonous alkaloids, and is closely allied to cocaine.
As the theine is without flavour, its presence or absence cannot be determined by the taste of the tea.
In the following tea assay proper the estimation of theine is not included.
The active principles of the leaves are theine and a volatile oil, to which latter the flavor and odor are due.
theine is no doubt a deadly poison, but we manage to drink it with tolerable safety in our tea and coffee.