science, would require a volume, instead of a few pages, which the limits of this Essay will afford, the enquiry must be made as perspicuous as the necessity of brevity will admit. Allowing they are diluting in health, their constant use may so attenuate the liquids as to destroy their natural force and tensity. But Boerhaave says, there is no proper diluent but water; it is therefore evident it is the water, and not the tea, which is the diluting medium. With respect to its being an attenuative of viscid humours, it can never possess this virtue from being a diluent, for an attenuant acts _specially_ on the particles, by diminishing their bulk, while the diluent acts upon the whole mass of the fluid. The general body of the liquid may be diluted while the viscid humours remain unresolved. Indeed, the operation of an attenuant is not easily known; for many are surprised that a slight inflammation should be so difficult to dissipate. But their surprise would cease, were they to consider, that medicines act more generally upon the whole body than abstractedly upon the part affected. Suppose to attenuate some coagulated blood, six grains of volatile salt were given, how small a proportion must come to the part diseased, when these grains, by the laws of circulation, will mix with the entire mass of blood, consisting at least of thirty pounds! Teas being said to promote natural excretions, can be no recommendation of what is generally used; for this constant effect must render them too copious, and thus, according to all physical experience, the blood must be thickened in the greater vessels, which frequently terminates in an atrophy. The appetite being excited by the drinking of tea, is more a proof of its attrition of the solids than any stimulus to a wholesome desire of food. This quality accounts for the acrimonious effects too many have experienced by its use. Many have not only had their blood impoverished, but corrupted by the constant drinking of these teas. Whether it arises from any positive acrimonious salt it naturally possesses, or from any acquired corrosiveness from its mode of drying, is not here necessary to enquire: it is only requisite to state that a pernicious effect is too fatally experienced by those who are unfortunately its slaves.