ERRATA. 



Pages 20 & 21, in the description of figures 3, 4, 5, 6, and 7 of Mr. Wooll- 



combe's paper, for " actual size " read " of actual size." 

 Page 20, line 6 from bottom, for " spherical" read " spheroid." 

 25, 15 insert":" after "discharge." 

 25, 13 for "horizontal. The range," read "horizontal, 



the range." 



512, line 10, for c for 1300 read_ c for 13000. 



515, lines 2, 4, & 5, for 6842'5, 181'0, and 6838'! read 6843'4, 182'0, and 

 6839-0. 



515, last line, for read 



516, line 6 from bottom, for even read ever. 



Note to the Communication of Mr. Huggins and Dr. Miller, of Feb. 26, 1863 : 

 " The first figure gives the spectrum of Aldebaran, the second that of Sirius, 

 the third that of a Orionis, and the fourth the Solar spectrum the left hand of 

 the figure representing the least refrangible extremity." 



OBITUARY. 

 Page iii, line 15, dele from " liable " to the end of the sentence. 



