Immediately to the Brain it self, the seat and organ of the principal Fa∣culties; either in regard of its
Substance; when it is indisposed for the
Ventricles; ‖ when any hot Vapour doth agitate and disturb the motion of the spirits, so as objects seem to turn round: or when any cold phlegmatic humour doth obstruct their motion, causing a privation of Sense, with convulsive motions in several parts.