and burthensome, and there is scarce Power enough left in the Blood to master its Particles, and apply ’em to their proper Uses; then, I say, ’tis time to make the Solids assist the Fluids in the dispensing of this Load which lies so hard upon ’em, which by gentle and close Exercise may be more easily done than many imagine; besides there may be a Distemper occasion’d by Particles of a looser Texture in the Blood, than is usual in most Cases, where Nature may contend and struggle with the hostile Particles, and yet not be able to get the Victory; where there may not be a perfect Fever, nor yet a quiet Coalition between the Blood and those foreign Particles. In such a Distemper as this, it must needs be very proper to give a due Agitation to the Blood, to prepare those Particles for the several Emunctories that are ready to receive ’em: and this may be perform’d by a just Digestion, if we do but consider how much the Body is adapted to it, and how much more Noble the Digestions are in the Animal Oeconomy, than those produc’d by humane Contrivance. In all artificial Digestions the Particles which are to be separated by the Agitation of the Liquor, must either evaporate, or subside; but in the Body there are a multitude of excretory Ducts ready to receive the Particles, of such a determinate Figure, as renders ’em excrementitious, and proper to be cast off; so that nothing is left but what is proper to the Animal Fluids, and which the Vehemence of the Motion mixes and unites at the same time that it breaks and moulds the others for their proper excretory Chanels; so that the Agitation is in this Case (as Dr. _Grew_ very well expresses it in his Treatise of _Mixture_) as “_carrying the Key to and fro, till it hit the Lock; or within the Lock, till it hit the Wards_.” How do we know the exact Degree of Agitation, that is requisite to unite the Particles of the Fat, which are continually flowing in a very great quantity into the Blood, with the Aqueous, by the Means of sulphureous or saline Particles? Do we not frequently observe in scorbutick Persons, who have lead a sedentary Life, that their Urines are cover’d with an oily Film of several Colours? and is it not very natural to suppose from thence, that the Blood wants a due Motion to keep those oily Parts united with the others? But it is no wonder, if these things are not well consider’d, when there is scarce any who makes Allowance enough for the quantity of the fat Particles, which are continually passing into the Blood, which must needs be very great, seeing the whole Skin is lin’d with its Vessels, besides what is heap’d up about the _Omentum_ and the Kidneys; so that Unctuous Medicines are copiously intruded upon the Habit of the Body when there is a great Wasting of the Flesh, without regarding that the Blood is not able to master the natural _Pinguedo_, but gives it down daily, in all probability, for want of a just degree of Agitation or Digestion, to keep it suspended in the Blood,