548 On the Refraction of Sound by the Atmosphere. 



intervening ground will increase this range and distinctness, as will also 

 a gentle wind, which brings the sound down and so counteracts the 

 effect of refraction. And hence we have an explanation of the surprising 

 distances to which sounds can sometimes be heard, particularly the ex- 

 plosion of meteors, as well as a reason for the custom of elevating church- 

 bells and sounds to be heard at great distances, September 1874.] 



