account of the increased temperature. 1 and 10 are only occasionally seen in this species.

Sp. 12. Characteristics: with the expansion of the continuous spectrum towards the blue, band 9 becomes very narrow, and cannot be observed with certainty. The other bands, with the exception of 7 and 8, are becoming wider and paler, while 2 and 3 still gain in supremacy.

Sp. 13. Characteristics: 9 has now entirely disappeared, 2 and 3 still retaining their supremacy.

Sp. 14. Characteristics: all the bands are pale and narrow; 2 and 3 will still be darkest, but the difference will not be so great as in the species preceding.

Sp. 15. Characteristics: in ordinary members of this group, 2 and 3 now alone remain visible: they are wide, but feeble, as the continuous spectrum which has been rapidly developing during the last changes is now strong.

Table B.-Showing the Stars in Dunér's Catalogue arranged in

(173)

(253)

(258)

(267)

2, 3, 7 well marked; 4, 5, 8 pale.

(271)

Feebly developed; the six ordinary bands feebly visible.
The six ordinary bands are plainly seen.

The six ordinary bands, but not very strong.

The six ordinary bands, feebly developed.

(247)

Bands plainly seen, but they are very pale, except 7 and 8.

(254)

2-8; wide and dark.

(273)

2-8; dark, but rather narrow.

(274)

There are seven bands, wide and rather dark. (I assume these to be 2-8.)

(285)

2-8; well seen, not remarkably wide.

(289)

2-8; very distinctly visible; 4 and 5 weak and narrow.