Professor Thomson desires to make the following corrections : 



Vol. VII. Page 394, line 6 from foot, dele half. 



398, 4 from top,/or 2,000,000 read 5200 x 10* ; 



and for 8,200,000 read 21000 x 10 6 . 



ib. 10 from top, for 10 tons read 53600 x 10 6 



tons ; and for 42 tons read 

 874000 X 10 6 tons. 

 Vol. VIII. 1 25, 1 1 from top, for sin read cos 0. 



- 128, 3 from foot, for tf> 3 () read <f> 2 (). 



ib. 2 from foot, for i//,(0) + ^ 2 ( 9 ) read 



157, 10 from top, for no read or without. 



ib. 11 from foot, dele Hence. 



ib. 8 and 7 from foot,ybr at the rate of one 



turn in 8 ^ -g wave lengths read at a 



A S 



certain rate. 



181, 13, for the part read the narrow pai't. 



ib. 1 6, for a read -. 



a 



- 182, 2, for 268 read 238. 



ib. 3, for 19 read 49. 



