580 DR J. HALM ON 
In the Astrophysical Journal, vol. xx. No. 2, Mr Lester has recently published 
most accurate measurements of the telluric Oxygen-bands of the solar spectrum. We 
shall proceed to investigate how far his observations are accounted for by the RypBEre- 
THIELE formula. The general structure of the groups A, B, a and a’, may be described 
as follows. Each group consists of two series of doublets called by Mr Lester the 
first and second band, in each of which he distinguishes the two components as the 
first and second series. In the following tables I exhibit the results of my computa- 
tions made on some of the series of the three groups A, B, and a. 3 
=) 
Oxycren-BAND, Agroup. First Band. First Series. B Group. First Band. First Series. 
log a,=0°70266,, »= 13168-40 log a,=0°90992,, Ay = 6867°379 
log b, = 6°57928,, — 10 log B; = 668740 — 10 
fl 
(m+ p) v obs. vcomp. | Obs. - Comp. (m+ p) d obs. A comp. | Obs. — Comp. | 
0°75 13168-29 "29 ‘00 0°8 6867-458 “458 000 
1-75 13167°81 80 +01 1°8 67794 ‘778 +016 
2°75 13166-89 90 - 01 2°8 68°337 344 — ‘007 
3°75 13165°61 rol ‘00 3°8 69°144 157 - 013 
4:75 13163°94 93 +01 4°8 70°220 218 +°002 
5°75, 13161°88 "86 +02 58 71°528 ‘527 +001 
6°75 13159°39 “40 - 01 6°8 73-078 085 — 007 
75 13156°51 ‘54 — 03 78 74-888 "893 — 005 
8:75 13153°30 30 ‘00 8°8 76:953 "952 +001 
9°75 13149°69 68 +-01 9°8 79°275 266 +:°009 
10°75 13145°70 68 +02 10°8 81°80 83 - 03 | 
11°75 13141°36 “30 +06 11°8 84°65 66 - 01 | 
12:75 13136°58 "DD +:03 12°8 87°75 ‘74 + 014 
13-75 1313143 ‘43 00 13°8 91-05 ‘08 - 03 | 
14:8 6894-67 69 - ‘02 : 
a Group. First Band. First Series. 
log a,=0°88746,, 
Ny = 6276°79 
log 8,=7°25370 — 10 
(m+ p) d obs. A comp. | Obs. — Comp. 
0-4 6276°81 Sl “00 
1°4 77:03 04 -— ‘Ol 
2°4 77-52 D4 — 02 
3°4 78°29 29 00 
4°4 79°31 Biull ‘00 
54 80-61 “60 +01 
6°4 82°16 15 +01 
74. 84:00 3°98 +:02 
8-4 86:09 09 ‘00 
9-4 88°48 ‘48 ‘00 
10°4 6291°14 ‘16 —'02 
I must remark here that the determination of » in band-spectra is a somewhat uncertaim 
operation. In the first series, for instance, the fraction 0°8 might have been used 
