THE COLOUEED STARS ABOUT KAPPA CRtTCIS. 



85 



small) drawing is given, and from the general correctness of it, 

 I am inclined to lay some stress on two things connected with 

 this map. Pirst, he puts two stars in the position now occupied 

 by Phi No. 66, a star which has considerably altered its place since 

 Herschel made his map. Second, the star No. 87, now a con- 

 spicuous star, is not represented at all. It is also remarkable 

 that he says nothing about colour, yet it is evident from his work 

 that he was rather fond of recording coloured stars, and it must 

 have been very manifest in this cluster seen through his reflector, 

 if at all like what it is now. 



In 1835, when Herschel went to the Cape, Kappa Crucis was 

 one of the objects which he rigorously examined, and deemed 

 worthy of a monograph, in which the places of all the stars, num- 

 bering 110, in the space included in his beautiful map, repre- 

 senting a space 90'- in E.A., and 7' 36" in dec, were recorded 

 with their magnitudes and colours. He particularly remarks 

 that he saw no nebulous light. 



In May, 1862, Mr. Abbott, of Tasmania, examined this object 

 with two telescopes — one 4| inches, 5 feet focus, the other 7 feet 

 focus, diameter not given — and communicated the result to the 

 Royal Society of Tasmania. The drawing which he made was 

 not published. 



He says " the smaller stars all partake of nearly the same 

 colour, Prussian Hue, some with a little (more or less) tint of 

 red or green mixed with the blue." Again, " in the Cape Observa- 

 tions Phi is laid down to the west, i.e. preceding the line joining 

 Delta and Epsilon ; they are now, however, all three situated in a 

 straiglit line, which when continued reaches the star Zeta." He 

 laid down seventy-five stars on the map, two of which were beyond 

 the Cape drawing, and five others which Mr. Abbott thought were 

 in the space, but not shown by Herschel (their positions are 

 unfortunately not given). Of the colours of the principal stars, 

 Mr. Abbott gives them as follows. Por convenience of reference 

 I put the three estimates of colour together : — 



Herschel. Abbott. Eussell. 



Grreenish white Grreenish yellow 

 Grreenish white 

 Bluish purple 

 Pale cobalt 

 Indian red 

 Ultramarine 

 Emerald green 

 Prussian blue 

 In my f Nos."77 82, 83, 84, 89, 101, 102, 103, 105, sky blue, 

 list. I Two small stars near Epsilon, Nos. 80 and 81, red. 



Alpha 



Grreenish white 



Beta 



Grreenish white 



Gramma 



Greenish white 



Delta 



Grreen 



Epsilon 



Eed 



Zeta 



Gi-reen 



Phi 



Blue-green 



a 



Puddy 



Grreenish yellow 

 Grreenish yellow 

 Grreenish yellow 

 Carmine red 

 Greenish yellow* 

 Sky blue 

 Carmine red 



* One observation greenish white. 



