Page [unnumbered]
CHAP. VI. The Nature of a Sound. p 208.
SECT. I.
ARTIC.
- 1 AN Elogy of the sense of Hearing: and the Relation of this and the praecedent Chapter.
- ibid.
- 2 The great Affinity betwixt Visible and Audi∣ble species; in their representation of the su∣perficial Conditions of Objects.
- 209
- 3 In the Causes and manner of their Destructi∣on.
- ibid.
- 4 In their Actinobolism, or Diffusion, both Sphaerical and Pyramidal.
- 210
- 5 In their certifying the sense of the Magnitude, Figure, and other Qualities of their Origi∣nals.
- ibid.
- 6 In the obscuration of Less by Greater.
- 211
- 7 In their offence of the organs, when excessive.
- ibid.
- 8 In their production of Heat by Multiplication.
- ibid.
- 9 In their Variability, according to the various disposition of the Medium.
- ibid.
- 10 In their chief Attributes, of Locomotion, Exsilition, Impaction, Resilition, Disgrega∣tion, Congregation.
- ibid.
SECT. II.
ARTIC.
- 1 THe Product of the Praemises, concerning the points of Cons••nt, and Dissent of Audible and Visible Species: viz That Sounds are Corporeal.
- 213
- 2 An obstruction of praejudice, from the gene∣rally supposed repugnant Authorities of some of the Ancients; expeded.
- ibid.
- 3 An Argument of the Corporiety of Sounds.
- 214
- 4 A Second Argument.
- ibid.
- COROLLARY.
- ibid.
- ibid.
- 5 The Causes of Concurrent Echoes, where the Audient is equally (almost) distant from the Sonant and Repercutient.
- ibid.
- COROLLARY. 2.
- 215
- 6 Why Concaves yield the strongest and longest Sounds.
- ibid.
- COROLLARY. 3.
- ibid
- 7 The reason of Concurrent Echoes, where the Audient is neer the 〈◊〉〈◊〉, and remote from the sonant.
- ibid.
- COROLLARY. 4.
- ibid.
- 8 W••y 〈◊〉〈◊〉 Monophon rehearse so much the f••••er syllables, by how much neerer the audient is to the R••f••••ctent.
- ibid.
- COROLLARY.
- ibid.
- ibid.
- 9 The reason of Polyphon Echoes.
- ibid.
- 10 A Third Argument of the Materiality of Sounds:
- 216
- 11 The necessity of a certain Configuration in a Sound; inferred from the Distinction of one sound from another, by the Sense.
- ibid.
- 12 The same confirmed by the Authority of Py∣thagoras, Plato, and Aristotle.
- ibid.
- 13 And by the Capacity of the most subtle parts of the Aer
- 217
- 14 The Reason and manner of the Diffusion of Sounds, explicated by a congruous Simile.
- ibid.
- 15 The most subtle Particles of the Aer onely, the material of Sounds.
- 218
- PARADOX.
- ibid.
- 16 One and the same numerical voice, not heard by two men, nor both ears of one man.
- ibid.
- 17 A PROBLEM not yet solved by any Philo∣sopher: viz. How such infinite Variety of Words is formed only by the various motions of the Tongue and Lips.
- 219
- 18 A Second (also yet unconquered) Difficulty, viz. the determinate Pernicity of the Aers mo∣tion, when exploded from the Lungs, in Speech.
- ibid.
- 19 All Sounds Created by Motion, and that ei∣ther when that intermediate Aer is confracted by two solids mutually resistent; or when the aer is percust by one Solid; or when a solid is percust by the Aer.
- ibid.
- 20 Rapidity of motion necessary to the Creation of a Sound, not in the First Case.
- 220
- 21 But, in the Second and Last.
- ibid.
- 22 That all Sounds are of equal Velocity in the Delation.
- ibid.
- 23 The Reason thereof.
- ibid.
- 24 To measure the Velocity of great Sounds.
- 221
- 25 Sounds, not subject to Retardation from ad∣verse; nor Acceleration, from Secund Winds.
- ibid.
SECT. III.
ARTIC.
- 1 THat all Sounds, where the Aer is percussed by one solid, are created immediately by the Frequency, not the Velocity of motion; de∣monstrated.
- 222
- 2 And likewise, where the Aer is the Percutient.
- ibid.
- 3 That all Acute sounds arise from the more, and Grave from the less Frequent percussions of the aer, demonstrated.
- 223
- 4 The suavity of musical Consonances, deduced from the more frequent; and Insuavity of Dis∣sonances from the less frequent Vnion of the vibrations of strings, in their Terms.
- 224
- 5 The same Analytically pr••sented in Scheme.
- 226
- 6 A just and unanswerable Exception against the former Harmonical Hypothesis.
- ibid.
- 7 PROBLEM 1. In what instant, an Har∣monical