An inquiry into the human mind, on the principles of common sense / By Thomas Reid.

  • Thomas Reid
Date:
1769
Catalogue details

Licence: Public Domain Mark

Credit: An inquiry into the human mind, on the principles of common sense / By Thomas Reid. Source: Wellcome Collection.

    95/416 page 69
    L.€9° ] CH A Bray. Of HEARING. Se cone bears in Variety of founds. Their place and diftance learn- ed by cuftom, without reafoning. Q OUNDS have probably no lefs variety KJ of modifications, than either taftes or odours. For, firft, founds differ in tone, The ear is capable of perceiving four or five hun- dred variations of tone in found, and probably as many different degrees of ftrength; by combi- ning thefe, we have above twenty fhouluie fim- ple founds that differ either in tone or ftrength {uppofing every tone to be perfect. But it is to be oblerved, that to make a perfe& tone, a great many undulations of elaftic air are re- quired, which muft all be of equal duration and xtent, and follow one another with perfect re- ularity ; and each undulation muft be made up of the advance and recoil of innumerable parti- cles of 2 {tic air, whofe motions are all uniform in direction, force, and time. Hence we may ealily conceive a prodigious variety in the fame tone, arifing from irregularities of it, occafioned by the Pea ratios n, figure, fituation, or manner of ftriking the fonorous body: from the confti- tution of the elaftic medium, or its being difturb- ae) Jae ed
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