Intelligence and Miscellaneous Articles. 



395 



The essential character of this type is to present a spectrum formed 

 of three luminous bands separated by dark intervals. The brightest 

 band is in the green ; it is generally strong, well marked, and very 

 dilated. Another, much feebler band is met with in the blue ; but 

 this band is often very difficultly visible. The third band is found 

 in the yellow, and expands towards the red ; this, however, is divided 

 into several others. 



All these bands have the characteristic that their light increases 

 in the direction of the violet, and then suddenly ceases. On the 

 contrary, towards the red they gradually shade into absolute black. 

 There is thus a complete opposition between this type and the third ; 

 for in this not only are the columns double in an equal space, but 

 they present the maximum of light on the side of the red, and the 

 minimum on that of the violet. The two spectra are therefore not 

 a modification of one and the same type ; they are evidently due to 

 substances completely different. 



The feebleness of their light, which prevents us from using the 

 spectroscope with a slit, hinders a rigorous definition of the sub- 

 stances which produce these phenomena. It may, however, be said 

 that there is great analogy with the reversed carbon spectrum. But 

 I think any conclusion of this kind is premature. 



The following is a list of the principal stars of this type, and their 

 position : — 



Number in 

 Schellerup's 



Right 

 ascension. 



Declination. 



Magni- 

 tude. 



Notes. 



catalogue. 













h m s 



/ 







41. 



4 36 2 



+67 54 



U 



Beautiful. 



43. 



4 42 8 



+28 16 



S 





51. 



4 58 1 



+ 59 



6 





78. 



6 26 9 



+38 33 



6§ 



Beautiful. 



89. 



7 11 5 



-11 43 



n 





124. 



9 44 6 



-22 22 



H 





128. 



10 5 8 



-34 38 



7 



Doubtful. 



132. 



10 30 7 



-12 39 



6 



Beautiful. 



136. 



10 44 8 



-20 30 



H 





152. 



12 38 5 



+46 13 



6 



Magnificent. 



159. 



13 19 3 



-11 59 



54 





163. 



13 47 3 



+41 2 



7 





229. 



19 26 5 



+ 76 17 



U 





238. 



20 8 6 



-21 45 



6^ 





249. 



21 25 8 



+50 58 



9 





252. 



21 38 6 



+37 13 



8i 





273. 



23 39 2 



+ 2 42 



6" 



Beautiful. 



A description of these spectra, with figures, will be inserted in the 

 memoir which is ready for publication ; this memoir will comprehend 

 the details of the third type, all the spectra of which present a superb 

 colonnade. I will here restrict myself to giving the curve of the 

 light of the 152nd, which is the most beautiful; the projecting lines 

 resemble dazzling and very brilliant lines near the end of the lumi- 

 nous band. 



