It will be self evident, I apprehend, to every excellent Physician, that a radical Knowledge of the Principles, and much Experience in the Exercise, of their Profession, were necessary to accommodate such a Work to the Comprehension of those, for whom it was more particularly calculated. Such Gentlemen must observe, that the certain Axiom of _Nature's curing Diseases_, which is equally true in our Day, as it was in that of _Hippocrates_, so habitually animates this Treatise, as not to require the least particular Reference. This _Hippocratic_ Truth as certain (though much less subject to general Observation) as that Disease, or Age, is finally prevalent over all sublunary Life, the most attentive Physicians discern the soonest, the most ingenuous readily confess: and hence springs that wholesome Zeal and Severity, with which Dr. _Tissot_ encounters such Prejudices of poor illiterate Persons, as either oppose, or very ignorantly precipitate, her Operations, in her Attainment of Health. These Prejudices indeed may seem, from this Work, to be still greater, and perhaps grosser too, in _Swisserland_ than among ourselves; though it is certain there is but too much Room for the Application of his salutary Cautions and Directions, even in this Capital; and doubtless abundantly more at great Distances from it. It may be very justly supposed, for _one_ Instance, that in most of those Cases in the Small Pocks, in which the Mother undertakes the Cure of her Child, or confides it to a Nurse, that Saffron, in a greater or less Quantity, and Sack or Mountain Whey, are generally still used in the Sickening before Eruption; to accelerate that very Eruption, whose gradual Appearance, about the fourth Day, from that of Seizure inclusive, is so favourable and promising to the Patient; and the Precipitation of which is often so highly pernicious to them. Most of, or rather all, his other Cautions and Corrections seem equally necessary here, as often as the Sick are similarly circumstanced, under the different acute Diseases in which he enjoins them.