34 



Dr. and Mrs. Huggins. On Wolf ami [Dec. 11, 



460 461 40L 463 4$4- 465 ** 447 4tfl 469 470 *7( 422 475 V4- 475" 



i . i . i . i . l . l . I . i . i . l . 



Vogdlfrj 





His diagram shows the band in No. 4018 to begin and end at about 

 the same positions as in the star 3956. 



It has been stated recently that the bright blue band in all three 

 stars is the carbon band in the blue, commencing near X 474 ;* and 

 more recently, notwithstanding the difference of position, according 

 to Vogel, of the band in one of the stars from that which it occupies 

 in the other two of as much as X 0040, that direct comparisons showed 



* Professor Lockyer, in the Bakerian Lecture for 1888 ('Roy. Soc. Proc.,' vol. 44, 

 p. 37), says of the star No. 4001 : " The bright band with its maximum at A. 468 is 

 the btight carbon fluting commencing at A 474 and extending towards the blue, 

 with its maximum at 468, as photographed at Kensington." 



Of the star 4013 : " The bright band in the blue at 473 is most probably the 

 carbon band bright upon a faint continuous spectrum, this producing the absorp- 

 tion from 486 to 473 " (loc. cit., p. 41). 



Of the star No. 3956: " The bright band at 470 is the carbon band in the blue, 

 commencing at 474, with its maximum at about 468, as observed and photographed 

 at Kensington" (loc. cit., p. 43). See Vogel's measures for the band in this star, 

 which are given in the text. 



Diagrams of the spectra of these stars are given at pp. 38, 40, and 41, based on 

 Vogel's observations and his curves, which, on a slightly reduced scale, are placed at 

 the bottom of the diagrams. The maximum of Voxel's curves is placed in all three 

 diagrams at \ 468, and agrees in the diagrams with the carbon band, whereas Vogel's 

 original curves and his measures place the maximum in the case of two of the stars- 

 at A 464, beyond the carbon band. 



