1191 
The results of the caleulation will be found in the following table, 
where the symbols have the s 
table on the refraction-theory. 
same meaning as in the corresponding 
D 1s W og | C 0/9 G | Colour : Observations 
| 
230 131 62 38 la 6 violet 
violet N 
22 45 290 68 32 17.3 blue— violet 
30 467 15 25 of Br blue 
blue N 
15 595 86 14 16.0 blue 
0 621 62 38 4.3 yellow | 
21 45 Boe ne het Sa ee vd yellow | 
| | ‚ yellow N 
30 414 56 44 4.7 yellow | 
15 266 22 78 4.7 yellow | | 
0 150 17 83 2.8 red | 
20 45 16 30 BZ) Deil red | red N 
eet. 38 Sap A ce ON red 
15 22 83 BY Males RG purple violet Z 
On 16.1 72 28 11.0 green-blue 
19 45 14.9 45 55 6.7 green-yellow | green- ped 
Z 
30 14.5 44 56 4.2 yellow 
15 13.1 59 Atel Ne 16 red 
| red z 
0 10.3 13 27 2996s red 
| a violet z 
18 45 Tes 14 26 Del red 
30 5.4 68 SZ 6.3 green-yellow 
15 4.6 67 33 | 6.3 green-yellow bre a 
0 4.8 62 38 52 yellow 
17 45 4.8 68 SP 2.8 red ; 
30 4.2 64 36 2.8 red red Z 
15 350 74 26 29.6 red | 
G4 2.9 73 27 | 6.8 | green-yellow 
In the column under “Observations” Z refers to the circles 
observed at Zutfen by 
Hissink in 
1899, 
N to the colours of an 
upper tangential arc seen at Nymegen (N°. 13 of the Table) on 
