THE SPECTRUM OF NOVA PERSEI AND THE STRUCTURE OF ITS BANDS. 289 
Taste XVIII.—-The Structure of the Bands in March-April 1901, and after 
August 1901, referred to X, as zero, and reduced to , = 4500. 
Structure of the Bands, Reversals, 
March-April. After August. March-April. After August. 
XM Intensity. A Intensity, My a E a My S a a 
BSE | Number See aimee 
Bon OS 5-2 | of Plates, 
T.M. T.M. i T.M. wae T.M. A & oo 
aa pe 
-—73 0 
— 55 5 
43 a 
6 
—31°5 
7 
—23'°9 |. o* sone : 5 
—21'8 Sex 
8 
-17°5 -17°8 
16-6 i - 
2 3 } =143 ~15-5+ 2 1 
—144 
iI 3 
-120 — 12:2 
10:4 ‘ 
13 e 11 
— 83 9 
~ 58 er 
7 ae |= 28 7 Benoa 89h 18 te 24 
— 38 -— 39 
13 10 | 
a. 7 o's 2-2 5 4 10 | 48 | 9 | 
+ 3-2 + 93 - + a6 ate to 27 | 
12°5 + 4:9 ; 
+ 68 + 65 
7 3 + 81 6 4 + 78 38 9 to 26 | 
+ 95 + 9-1 
12:5 8 
a 7 ie 5 12°7 1 2 
2° Oo Dy 
+13-0 +13-0 : ga 3 3 +12-4 10and11 
115 +15:1 
3 
+168 10 +16°9 i 
+201 8 + 21:3 
+251 7 
5:5 
+31:7 
3°5 
+34 
25 
+ 36:4 
+ 40°5 
0°5 
+56 
* Sharp Fraunhofer line, 1901, March 18-20 and March 25. 
