THE STRUCTURE OF THE SERIES OF LINE- AND BAND-SPECTRA, 587 
which I shall call [,, I, and I,, are discussed. or the series I, and I, the computa- 
tions have been made on every fifth line, for I, on every second. 
la. Id (first component). 
“Tog o,=1°98171, ,=3883°50, An =2199°39. log a, = 1°93237 , A, =3876'56, A, =2708°35. 
(m+ ») X obs. d comp. On C, (m+ p) d obs. d comp. 0, -C. 
5:0 388325 "24 +01 70:0 3823°98 98 00 
10:0 3882744 “46 - 02 75:0 3816°33 33 700 
15:0 3881°15 ‘16 - 01 80:0 3808-29 ‘27 +02 
20°0 3879°33 34 - 01 85-0 3799°82 “82 ‘00 
25-0 3876'99 701 — +02 90:0 379101 ‘00 +01 
30°0 3874'14 16 -— 02 95-0 3781:83 82 +01 
35°0 3870°80 enh) +01 1000 3772°32 “32 ‘00 
40°0 3866°94 ‘OF — 03 105-0 3762°52 “51 +°01 
45°0 3862°62 ‘64 — -02 110°0 3752°41 ‘41 ‘00 
50°0 2857°81 "82 -— Ol 115:0 3742°04 05) - 01 
55:0 3852°53 ‘53 ‘00 120°0 3731°44 “45 - 01 
60:0 © 3846°79 (el +02 125-0 3720°61 62 - 01 
65°0 3840°59 ‘56 + 03 130°0 3709°63 60 +°03 
70°0 3833°95 ‘90 +05 1350 3698-50 “40 +10 
74:0 3828°32 26 + '06 
Te. 
log a,=1°53310, AJ=3777'78, Awe =3368°78. 
(m+ p») X obs. X comp. O.-C. 
64-0 3685-01 4°99 +02 
66:0 3680°51 “49 +02 
68:0 3676°00 ‘00 ‘00 
70-0 3671°49 ‘50 - 01 
72:0 3667-00 01 - 01 
74:0 3662°52 D4 — 02 
76:0 3658°05 ‘06 - 01 
78:0 3653-62 62 ‘00 
80:0 3649-21 “20 +°01 
82:0 3644-83 81 +02 
84:0 3640°45 ‘44 +01 
The smallness of the residuals in the last columns proves again the applicability of 
the Rypperc-THIELE equation, if we admit the suggested subdivision of the series into 
three apparently coherent branches. With regard to the other series of the band 
mentioned by Dr JuNGBLUTH, analogous structures are apparent, but I have not yet 
found time to undertake the necessary computations. 
In his paper Dr JuNGBLUTH suggests that the tails of the four series may probably 
be represented by four faint bands shading off towards the red at wave-lengths 3579, 
3603, 3629 and 3658. This suggestion had been already made by Mr Kine, who 
had first observed the peculiar shadings in question. For several reasons I doubt 
the correctness of this view, and rather incline to think that Mr K1na’s bands represent 
