. Sylva sylvarum; or, A natural history. In ten centuries; whereunto is newly added the History natural and experimental of life and death, or of the prolongation of life. NATURAL HISTORY 29 Century Ufick in the Pra&ice, hath been well purfucd, and ingood Variety 5 but in the Theory, and especially inthe yielding of the Caufei of the Pra&ick, very weak-ly i being reduced into certain Myftical fubtilties ,and not much truth. We fhall therefore, after ourmanner, joyn the Contemplative and Atlive Parttogether. All Sounds are either Mujical Sounds, which we call Tones; whereuntothere may be a


. Sylva sylvarum; or, A natural history. In ten centuries; whereunto is newly added the History natural and experimental of life and death, or of the prolongation of life. NATURAL HISTORY 29 Century Ufick in the Pra&ice, hath been well purfucd, and ingood Variety 5 but in the Theory, and especially inthe yielding of the Caufei of the Pra&ick, very weak-ly i being reduced into certain Myftical fubtilties ,and not much truth. We fhall therefore, after ourmanner, joyn the Contemplative and Atlive Parttogether. All Sounds are either Mujical Sounds, which we call Tones; whereuntothere may be an Harmony, which Sounds are ever equal : As Singing, theSounds of Stringed, and Wind-Inftrumcnts, the Ringing of Bells, &c. orImmufical Sounds, which arc ever unequal: Such as are the Voice in Speak-ing, all Whifperings, all Voices of Beafts and Birds (except they be Sing-ing Birds;) all Percuffions, of Stones, Wood, Parchment, Skins, (as inDrums) and infinite others. The Sounds that produce Tones, arc ever from fuch Bodies as are intheir Parts and Pores equal; as well as the Sounds themielves are equal:And fuch are the Percuffions of Metal, as in Bells •?> of Glafi, as in the


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