OF SERPENTS. i6i 



What conftitutes Unifonance, is the Equality of the Num- 

 ber of Vibrations : Unifon is the firft and greateli of Concords. 

 Others fay, it is only that in Sounds which Unity is in Numbers. 



Being once in a Room where there was a Bafs-Viol, and 

 ftriking one of the Strings, a loofe Quarry of Glafs in the 

 Window, jarr'd every time that String was flruck, which it wou'd 

 not do upon ftriking any of the other difcordant Strings. The 

 Reafon may be, viz. That the times of the Vibration of the 

 loofe Quarry, were equal or near Concordance to thofe of the 

 String. A Gentleman of my Acquaintance, when he founded a 

 particular Tone on the Bais-Viol, very plainly heard the Noife 

 of the Glafs of the Clock in his Chamber, which Glafs never 



moved, upon his founding any other Tone It is a general 



Remark, that an JJjiifon-Siring will receive the Motion, and fo ' 

 tremble, when another Unifon is made to found ; and yet all other 

 Strings of the fame Inftrument, that are notUnifons, fhall remain 

 lilent and unmoved. 



MusicK does not only exert its Force on the Paflions and 

 Affedlions, and mufical Inftruments, but on the Parts of the hu- 

 man Body alfo. Witnefs the GaJcoig?ie-Knight , (mention'd by 

 Mr. Boyle) who could not contain his Water, at the playing of 

 a Bag-pipe : The V/oman, mention'd by the fame Author, who 

 would burft out in Tears, at the hearing of a certain Tune, with 

 which other People were but little affeded : And in this County, 

 near Rochdale, there is a certain Man, who can't forbear dancing, 

 if in a Houfe, or Market, upon hearing a certain Tune fung. 



Wo N D E R not at the ftrange Effects of mufical Sounds, when 

 other Sounds ftrangely aff:^: the Mind. How are the PafTions 

 excited by the Sound of a Drum and the Difcharge of Canons. . . . 

 Not only human Minds and Bodies are affedted by the Impreffion 

 of Sounds, but even Things without Life. 



K IRC HER tells us of a large Stone that would tremble at 

 the Sound of one particular Organ-Pipe. Merjhine alfo tells us, 

 of a particular part of a Pavement that would fliake and tremble, 

 as if the Earth would open, when the Organs play'd. Mr. Boyle 

 adds, that Seats will tremble at the Sound of Organs, that he has 

 felt his Hat do fo under his Fland, at certain Notts, both of 

 Organs and Difcourfe ; and that he was well inform'd, every well- 

 built Vault, would anfwer feme determinate Note. 



Y We 



