Of the Nature of which we may probably conjecture, that it is, when mixed with the Blood, being exalted by the Heat of the Climate, of so great Force and Energy, that it immediately raises an extraordinary Fermentation in the whole Arterial Fluid, by which its Texture and _Crasis_ is very considerably altered; the Consequent of which Alteration, when the Ebullition is over, must necessarily be a Change in the _Cohæsion_ of its Parts, by which the _Globules_, which did before with equal Force press each other, have now a very differing and irregular _Nisus_ or Action, so that some of ’em do so firmly cohere together, as to compose _Moleculæ_, or small Clusters; upon which Account there being now a greater number of _Globules_ contained in the same Space than before, and besides, the _Impulse_ of many of these when united together differing according to the Conditions of their _Cohæsion_, as to Magnitude, Figure, _&c._ not only will the _Impetus_, with which this Fluid is drove towards the Parts, be at some Strokes at least greater than ordinary; but the Pressure upon the Blood Vessels must be very unequal and irregular; and this more especially will be felt in them which are most easily distended; such are those of the Brain, _&c._ And hereupon the Fluid of the Nerves must necessarily be put into various _Undulatory_ Motions, some of which will be like unto those which different _Objects_ acting upon the Organs or Passions of the Mind, do naturally excite in _It_, whereupon such Actions must follow in the Body, as are usually the Consequents of the several _Species_ of Sadns, Joy, Despair, or the like Determinations of the Thoughts; and we shall readily pronounce one in this Condition, _Sad_, _Joyful_, _Timorous_, _&c._ and all without any apparent Reason or Cause; that is, in one Word, we shall say he is _Delirous_.