“The quality is moderately hot, proper for winter or summer. The drink is declared to be most wholesome, preserving in perfect health until extreme old age. The particular virtues are these: It maketh the body active and lusty. It helpeth the headache, giddiness and heaviness thereof. It removeth the obstructions of the spleen, it is very good against the stone and gravel. It taketh away the difficulty of breathing, opening obstructions. It is good against lippitude distillations, and cleareth the sight. It removeth lassitude, and cleanseth and purifieth acrid humours and a hot liver. It is good against crudities, strengthening the weakness of the stomach, causing good appetite and digestion, and particularly for men of corpulent body, and such as are great eaters of flesh. It vanquisheth heavy dreams, easeth the brain, and strengtheneth the memory. It overcometh superfluous sleep, and prevents sleepiness in general, a draught of the infusion being taken; so that without trouble whole nights may be spent in study without hurt to the body. It prevents and cures agues, surfeits, and fevers by infusing a fit quantity of the leaf, thereby provoking a most gentle vomit and breathing of the pores, and hath been given with wonderful success. It (being prepared and drunk with milk and water) strengtheneth the inward parts and prevents consumptions. It is good for colds, dropsies, and scurvies, and expelleth infection. And that the virtues and excellencies of this leaf and drink are many and great is evident and manifest by the high esteem and use of it (especially of late years) by the physicians and knowing men of France, Italy, Holland, and other parts of Christendom, and in England it hath been sold in the leaf for six pounds, and sometimes for ten pounds, the pound weight; and in respect of its former scarceness and dearness, it hath been only used as a regalia in high treatments and entertainments, and presents made thereof to princes and grandees till the year 1657.”
From a 17th century pamphlet on the subject of tea, quoted in Byegone England : Social Studies In Its Historic Byways And Highways by William Andrews, (1892). He also quotes from an Edmund Waller poem, thus: “The Muses’s friend, tea does our fancy aid / Repress those vapours which the head invade”.