It may afford some Light towards Understanding the Nature of this Poison, to observe that _Apulia_ is the hottest Part of all _Italy_, lying _Eastward_, and having all the Summer long but very little Rain to temper the Heats, so that the Inhabitants, as one of that Country observes (50), do breath an Air, as it were, out of a fiery Furnace; hence their Temperament is dry, and adust, as appears by their being generally lean, passionate, impatient, ready to Action, quick-witted, very subject to inflammatory Distempers, Phrensies, Melancholy, and the like, upon which Account there are more mad People in this, than in all the other Parts of _Italy_; nay, what in other Countries is but a light Melancholy, arises here to a great Heigth; for Women in a _Chlorosis_ do suffer almost the same Symptoms as Persons poisoned by the _Tarantula_ do, and are cured the same Way; and in like manner the Venom of the _Scorpion_ does here in Effects and Cure agree very much with that of this _Spider_. From all this History it sufficiently appears, that those that are bitten by a _Tarantula_, do thereupon become _Delirous_, and that in order to account for their surprizing Symptoms; the Nature of a _Delirium_, from which many of them proceed, ought to be understood. Such is the Constitution of the _Human Œconomy_, that _as_ upon the Impression of outward _Objects_ made upon the _Organs_, and by the Fluid of the Nerves conveyed to the _Common Sensory_; different _Species_ are excited there, and represented to the Mind; _so_ likewise upon this Representation, at the Command and Pleasure of the Soul, part of the same Fluid is determin’d into the Muscles, and mixing with the Arterial Blood there, performs all the Variety of Voluntary Motions and Actions. This Order has been always so constant in Us, that at length by a kind of natural Habitude, without the Intervention of the Reasoning Faculty, Representations made to the Mind do immediately and necessarily produce suitable Motions in the Bodily Organs. When therefore these Representations are irregular, the Actions consequent to them must necessarily be so too. This being premis’d, it may perhaps be probably said, that a _Delirium_ is the Representation and various Composition of several _Species_ to the Mind, without any Order or Coherence; together, at least most commonly, with irregular, or, as it were, undesigned Motions of the Body; that is, such a wandring and irregular Motion of the Nervous Fluid, whereby several Objects are represented to the Mind, and upon this Representation divers Operations perform’d by the Body, tho’ those Objects are not impress’d upon the Organs, nor those Operations or Motions deliberately commanded by the Soul.