Daily Instances of Persons, who come from different Parts to consult me, without being capable of answering the Questions I ask them, and the like Complaints of many other Physicians on the same Account, engaged me to write the last Chapter of this Work. I shall conclude this Introduction with some Remarks, necessary to facilitate the Knowledge of a few Terms, which were unavoidable in the Course of it. The Pulse commonly beats in a Person in good Health, from the Age of eighteen or twenty to about sixty six Years, between sixty and seventy Times in a Minute. It sometimes comes short of this in old Persons, and in very young Children it beats quicker: until the Age of three or four Years the Difference amounts at least to a third; after which it diminishes by Degrees. An intelligent Person, who shall often touch and attend to his own Pulse, and frequently to other Peoples, will be able to judge, with sufficient Exactness, of the Degree of a Fever in a sick Person. If the Strokes are but one third above their Number in a healthy State, the Fever is not very violent: which it is, as often as it amounts to half as many more as in Health. It is very highly dangerous, and may be generally pronounced mortal, when there are two Strokes in the Time of one. We must not however judge of the Pulse, solely by its Quickness, but by its Strength or Weakness; its Hardness or Softness; and the Regularity or Irregularity of it. There is no Occasion to define the strong and the feeble Pulse. The Strength of it generally affords a good Prognostic, and, supposing it too strong, it may easily be lowered. The weak Pulse is often very menacing. If the Pulse, in meeting the Touch, excites the Notion of a dry Stroke, as though the Artery consisted of Wood, or of some Metal, we term it _hard_; the opposite to which is called _soft_, and generally promises better. If it be strong and yet soft, even though it be quick, it may be considered as a very hopeful Circumstance. But if it is strong and hard, that commonly is a Token of an Inflammation, and indicates Bleeding and the cooling Regimen. Should it be, at the same time, small, quick and hard, the Danger is indeed very pressing. We call that Pulse regular, a continued Succession of whole Strokes are made in equal Intervals of Time; and in which Intervals, not a single Stroke is wanting (since if that is its State, it is called an intermitting Pulse.) The Beats or Pulsations are also supposed to resemble each other so exactly in Quality too, that one is not strong, and the next alternately feeble.