132 



Sir Norman Lockyer. 



In the last stages of all, before final extinction, the stars will be so 

 feeble that the details of their spectra cannot be recorded ; so that the 

 expected phenomena, on following out continuity of changes, cannot 

 be checked by direct observation. The sequence of changes which we 

 should expect to occur would be : — 



(1) The gradual darkening of the carbon flutings and subsequent 



paling as the continuous spectrum becomes weaker. 



(2) The gradual fading out of those solar lines which do not persist 



as low as flame temperature. 



(3) The gradual increase in the intensity of absorption lines or 



bands representative of low temperature. 



Taking Duner's observations as we find them, we arrange the stars 

 in seven species, particulars of which follow : — 



Species 1. 



Characteristics. — Four zones. Band 6 pale ; secondary bands 4 and 



5 present, or perhaps 4 without 5. 

 No. 3, 7 Schj., Mag. 7*0 Rrj. — Four zones, band 6 weaker than 



usual ; band 4 fairly distinct. 

 No. 18, 74 Schj.^ Mag. 6*5 Rrj. — Four zones ; band 6 rather weak ; 



4 and 5 well seen. 



Species 2. 



Characteristics — Four zones. Band 6 pale ; secondary bands 2, 3, 4, 

 and 5 present. 



No. 11, 51 Schj., Mag. 6-3 Rrj. — Four zones. Band 6 weaker than 

 9 and 10 ; 2, 3, 4, and 5 seen. 



Species 3. 



Characteristics— Fovlt zones. Band 6 pale; secondary bands 1, 2, 3, 

 4, 5, 7, and 8. 



• No. 25, 132 Schj. {U Hydrce), Mag. 5-4 {Var.) Rrj.— Four zones. 

 Band 6 weak ; 1, 2, 3, 4, 5, 7, and 8 strongly developed. 



No. 26, D.3L + 68° 617, Mag. 6-2 Rrj.— Youv zones. Band 6 

 weaker than 9 and 10; 1, 2, 3 rather weak; 4 and 5 well seen; 

 7 and 8 seen with difiiculty. 



No. 65, 19 Fiscium, Mag. 6-2 Rrj. — Four zones. Band 6 rela- 

 tively feeble ; 1,2, 3, 4, 5, 7, and 8 are visible. 



Species 4. 



Characteristics, — Four zones. Band 6 dark; secondary bands all 

 visible. 



