The young gentleman and lady's philosophy : in a continued survey of the works of nature and art by way of dialogue . nderitand you very well, as there isno more Difficulty in conceiving the Relation there is betweenthe Sound and its Echo, than there is between the ObjeiSt and its Image by refleiled Light: But a Circumflance in which they differ is this, that, with regard to. Light, the Angle ofRefleilion, to the Eye, muft be equal to that of Inci-dence, that the Image may appear : But, let me fland where Iwill, I hear the Echo, though not equally plain anddiftinft. I have often taken Notice,
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The young gentleman and lady's philosophy : in a continued survey of the works of nature and art by way of dialogue . nderitand you very well, as there isno more Difficulty in conceiving the Relation there is betweenthe Sound and its Echo, than there is between the ObjeiSt and its Image by refleiled Light: But a Circumflance in which they differ is this, that, with regard to. Light, the Angle ofRefleilion, to the Eye, muft be equal to that of Inci-dence, that the Image may appear : But, let me fland where Iwill, I hear the Echo, though not equally plain anddiftinft. I have often taken Notice, wlien I have been walking in the Fields, at a Diftance from the Town, that this Refledlionof Sound has been extremely fenfiMe in a Variety of Echos, fromevery confiderable Sound which has had Force enough to ftrike.againft the Side of our Church, for producing fuch a Repercuf-fion, or Refledlion : Thus, the Report of a Gun is alwaysheard twice; and it was not long fince I obierved a Man cleav-ing of Wood at about a Quarter of a Mile Diftance from the Vol. II. A aa Cbuich, The The O KX of the I II S E E iUulHated. and Ladys Philosophy. 361 of the! Moorf would bei a Thing impoffihle in Nature, and wefhould never have known or have had the leafi: Ideas of a Firma-ment of ufeful Stars. It appears to me, that the plalneft Things in Life may be perverted into a Matter of furprizing Dif-putation, by a Set of People who feem to have no inteilcdlualOptics, fmce even the very Do6lrine of Shadows icfelf mufi:, onewould think, have beamed on their Minds the Light of Truth. - But to return : Pray^ what are the next remarkable Pro-perties of Air in rerpe(51: to Sounds ? Clean. The next Property of thefe aereal Pulfes is, that theyare fubjedl to a Pvcfleclion from any fixed Plain, or Obftacle, from the fame Caufe with that of the Particles of Light; for theParticles both of Light and Air, being folid Bodies, will beequally refledled by the Re-aftion of the Particles of any fixedObjedl on which