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 f q Of the primary Seat pf Spirits, but that on fucli Occafions they are called, by the Senfation upon the af- fected Part, from the nervous Origin where they are elaborated. SECOND LY y It fometimes happens that the Spirits degenerate from their native Purity * as alfo at others, that they prove abortive, in not arriving to their utmoft Maturity, whereby they lie more open to foreign Imprefiions of Dirtemperature. BUT when the Juices, or common Promptuary from whence the Spirits are generated, is not uniform, genuine, and per- feci in kind, it is impoffible that Spirits ihould be made from it in any tolerable Perfection - for one may as well pretend to walk a Brick, or draw clear Water from a foul Spring, as expect pure and natural Spirits from a corrupt and vitiated Chyle - 7 although even when the Chyle is in right Order, there may various Errors happen in the Generation of Spirits - 7 as from too great an Heat agitating the Blood in a preternatural Manner, or from an imperfect or unequal Separation of Particles, or from too much Cold caufmg an Intermixture of Crudities ^ and again, although the Spirits are