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 of a T-eftilence. 6y the Light and A&ivity of the Sun-Beams j and the brighter and more active they are, the better do they perform their Offices in the O Economy, as from their Efficiency is procured a State of Health and Vigour both in Body and Mind. IT is of no great Moment to enquire^ what Quantity of Spirit is neceffary for the Confer vat ion and Support of an humane Body, fo 'that we do but know they par- take of the Source from whence they are generated, infomuch that they are more or lefs perfect, according to the greater or leifer Degree of Purity in their productive Juices= BUT f muft here acknowledge my felf diffident in that Opinion of the Spirits be- ing prepared of a d liferent Nature for par- ticular Parts, for according to the Influen- ces of the Mind, and the Contiguity, Recti- tude, or Confent of the VefTels, they are by a voluntary A£b determined the fame into this or that Limb or Part : Which is manifeft enough in the Prick of a Needie, or a venomous Bite, from the great Afflu- ence of Spirits to that Part - I have there- fore no Notion of a continued Emanation f 3 of