The experiments which the chemists have tried with this white powder, with a view to the discovery of the action it may be able to exert upon living bodies when taken into them, appear to prove simply this. When swallowed in proper quantities it has a most wonderful sustaining power. It seems as if it enabled food which is taken with it to go one-fourth part as far again in supporting the strength of the body, as it would without the addition; and if it does this, it is certainly not because it adds an equal amount of bulk to the food, for a trifling pinch of three or four grains of the powder, as much as could be laid on a silver four-penny piece, is enough for the purpose during one day. If a healthy man has half a pound of bread taken from his daily meals, and three grains of the white powder of tea added in its stead, his body does not miss the bread. The white salt of tea, coffee, and cocoa, seems to possess the power of relieving the body from the effects of wear and waste, and so of decreasing its requirement of food. This extraordinary substance also produces another very remarkable effect on the living body, when it is swallowed in these small quantities. It cheers and enlivens, at the same time that it aids in supporting the bulk and strength of the frame. The chemist finds, when he examines its precise composition, that it is even more adapted to supply the substance which the nerves and brain lose by wear and tear, than to diminish the loss the flesh undergoes from the same cause. The white powdery ingredient of coffee and tea is most probably a rich and strong nerve-food, provided for the support of the nervous structure and brain, rather than for the nourishment of the flesh; it is nerve-making substance rather than flesh-making substance; and it exerts some mysterious and very extraordinary influence of lessening the waste of wear and tear in the structures of the living frame, without stopping their useful activity in the same degree. In order that the nature and suspected action of this white powder of tea, coffee, and cocoa may be kept fairly in the mind, it may be well, instead of speaking of it by its learned name, to call it the nerve-food ingredient of these beverages. Some further remark might very well be made touching the probable reason why these beverages, thus rich in a nerve-strengthening food, should have come into such general use in modern times, although scarcely employed in remote ages. But it may, on the whole, be best merely to say that it is quite in accordance with the general management of the Gracious Providence who rules over man’s world, that the additional wear and tear of nerve and brain, which of necessity follows from the increase in numbers in the human race, and from the advance of the arts and civilization, should have had some counteracting compensation provided for its relief.