66 Mr. J. N. Lockyer. On the Classification [Apr. 12, 



work assuredly points to their existence ; it will therefore be ex- 

 tremely interesting if future observations result in their discovery. 

 It is possible, however, that No. 150 of Doner's list belongs to this 

 species, but the details are insufficient to say with certainty. His 

 description is as follows: — "150. II me parait y avoir tine bande 

 etroite dans le rouge, et une plus large dans le vert " (p. 55). 



Sp. 2. Characteristics : appearance of Fe. The number of bands 

 now visible is three — namely, 2, 3, and 7. The iron comes out as a 

 result of the increased temperature. Mg(l) and Mn(l) are still 

 masked by the bright carbon flutings, and there is still insufficient 

 luminosity to make the apparent absorption-band 9 dark enough to 

 be noticed. 



Sp. 3. Characteristics : appearance of Mg 500, which has pre- 

 viously been masked by the carbon bright flutings 517. 7 and 8 are 

 now the darkest band in the spectrum. 



Sp. 4. Characteristics : appearance of Pb(l) 546, i.e., band 5. 

 This, if present in the earlier species at all, would be masked by the 

 bright carbon at 564. 



Sp. 5. Characteristics : Mn(l) is now unmasked. The bands now 

 visible are 2, 3, 4, 5, 7, and 8, the two latter still being the widest 

 and darkest, because they are essentially low-temperature pheno- 

 mena. 



Sp. 6. Characteristics : band 6, i.e., Ba(2), 525, is now added. The 

 first band of Ba at 515 is masked by the bright carbon at 517. The 

 bands now visible are 2 — 8, 7 and 8 still being widest and darkest. 

 They will all be pretty wide, and they will be dark because the con- 

 tinuous spectrum will be feebly developed. 



Sp. 7. Characteristics : appearance of band 9. This, which has 

 been already specially referred to, has been too wide and pale to be 

 observed in the earlier species. Its present appearance is due to the 

 narrowing and brightening of the carbon at 474 and the brightening 

 of the continuous spectrum, the result being a greater contrast. 

 Bands 7 and 8 still retain their supremacy, but all the bands will be 

 moderately wide and dark. 



Sp. 8. Characteristics : all the bands 2—9 are more prominent, so 

 that 7 and 8 have almost lost their supremacy. 



Sp. 9. Characteristics : appearance of band 1, the origin of which 

 has not yet been determined. All the bands are well seen, and are 

 moderately wide and dark. 



Sp. 10. Characteristics : appearance of band 10, and in some cases 

 11. These become visible on account of the brightening of the 

 carbon B fluting and the hydrocarbon fluting at 431. The spectrum 

 is now at its greatest beauty, and is discontinuous. 



Sp. 11. Characteristics : the bands are now becoming wider, and 

 2 and 3 are gaining in supremacy; 7 and 8 become narrower on 



