130 NATURAL HISTORY. 



again as soon as the voice is delivered ; as hath been 

 partly said : others are more deliberate, that is, give 

 more space between the voice and the echo, which 

 is caused by the local nearness or distance : some 

 will report a longer train of words, and some a 

 shorter ; some more loud, full as loud as the original, 

 and sometimes more loud, and some weaker and 

 fainter. 



253. Where echoes come from several parts at 

 the same distance, they must needs make, as it were, 

 a choir of echoes, and so make the report greater, 

 and even a continued echo ; which you shall find in 

 some hills that stand encompassed theatre-like. 



254. It doth not yet appear that there is refrac 

 tion in sounds, as well as in species visible. For I 

 do not think, that if a sound should pass through 

 divers mediums, as air, cloth, wood, it would deliver 

 the sound in a differing place from that unto which 

 it is deferred ; which is the proper effect of refrac 

 tion. But maj oration, which is also the work of 

 refraction, appeareth plainly in sounds, as hath been 

 handled at full, but it is not by diversity of mediums. 

 Experiments in consort touching the consent and dissent 



between visibles and audibles. 

 We have &quot; obiter,&quot; for demonstration s sake, 

 used in divers instances the examples of the sight 

 and things visible, to illustrate the nature of sounds : 

 but we think good now to prosecute that comparison 

 more fully. 



Consent of visible* and audibles. 



255. Both of them spread themselves in round, 



