CHAP. XIII. Of the Intellectual Faculty; which is peculiar to the Humane Soul.
[unspec 1] BEfore we enter upon any other Discourse rela∣ting to this Subject, it is necessary to observe the Seat or Instrument of this Faculty, and then its Action, or Method of Operating.
Now the Seat,* 1.1 or rather the Throne of the Rea∣sonable Soul, where it sits and reigns Supreme, is not the Heart, (as was generally supposed before Plato and Hippocrates) but the Brain: For the Heart is not capable of Wisdom, but is properly the Seat and Source of Vegetation. Now the Brain, which in Man much exceeds the Quantity assign'd to any other Creature, must be so contriv'd and dispos'd, that the Reasonable Soul may act freely; and in order hereunto, the Figure of it must be almost like that of a Ship; it must not be a perfect Round, it must not be too Great, nor too Little; though of the Two Extremes the Excess is much less to be found fault with, than the Defect: It must be compos'd of a delicate fluid Substance, of fine and subtle Parts, and these well joyn'd together, and all united without any Separation, or void Spaces throughout the whole. It hath Four small Cavi∣ties