ERRATA. 



Page 170, second line of table, 

 for Bell-metal at 0° vibrates during 55 sees. ; at 100° it vibrates during 15 sees. 

 read _ „ „ „ 55 n ' . . * . » 40 " 



Page 171, line 27 from top, for air of glass tubes of different diameters, renders 

 read air in glass tubes of different diameters, render 

 „ 173, line 11 from top, dele The frequency of the vibrations of 

 „ 195, „ 12 from bottom, for from the globular read having the globular 

 ., 367, Mr. W. H. Everett's paper, in first equation, for rd 2 6 read r 2 dd 



