PLATES. 



I. Illustrative of Mr. G. Darwin's Paper on Maps of the World. 

 II.-V. Illustrative of Prof. R. Bunsen's Paper on Spectral-Analytical 

 Researches. 



ERRATA. 



Volume 49. 



Page 457, line 9 from bottom, for read O. 



— — line 7 from bottom, for C Q read O Q. 



— 466, lines 5 and 6, for intersection read intersections, and dele and 



to the origin. 



— — line 1 3, for flow-line read straight line. 



— 471, first line of § 42, for § 39 read § 38. 



Plate IX. fig. 3. — The middle point of the straight line A B should be 



marked O. 

 Plate X. fig. 6. — The circle should not extend into the left-hand half 



of the figure, or should be shown there only by a dotted 



line. 



Volume 50. 



Page 281, 



line 12 should read : — 







a' = B 2 /i 2 +B 4 /* 4 + .., 



. +&c. 



Page 316, 



lines 6, 7 should stand : — 



= 122*, 



3 P ' 



4 5 





= 533 miles. 

 And dele line 8. 





