S04 Dr. Brewster on the Affections of Light 
Extreme conjugate 
diameter of second red ring 
- 11 ° 6 ' 
Ditto 
third 
14 4^ 
Ditto 
fourth 
18 30 
Ditto 
fifth 
22 12 
Ditto 
sixth 
- 25 54 
Ditto 
seventh - 
- 29 36 
Ditto 
eighth 
33 >8 ■ 
Ditto 
ninth 
- 37 0 
Ditto 
tenth 
40 42 
Black space between the oval centres - 
i4i 
In order to convey a correct notion of the different colours 
which compose the elliptical rings, and which vary in different 
parts of the same ring, I have given in Plate VII., fig. i, an 
outline of the first six rings with references to the following 
table, which contains the colours in five different parts of the 
semicircumference of each ring. 
O 
o. 
u 
c 
o 
> 
o 
I. 
2. 
u 
<u 
"73 
Light blue with a purplish tinge 
fading into white above, and gra- 
dually deepening into black below. 
White fading into yellow above, 
and light blue below. 
Yellow shading off into white be- 
low, and red above. 
Red, with a pink tinge, and sha- 
ding into yellow below. 
f 5. Black fading into light blue to- 
I wards 6. 
6. Light blue fading into green. 
Yellow shading into red. 
[_8. Deep crimson. 
1 ^: 
f 9. Blue, very little. 
I 10. Green, very little, the green be- 
O ^ little below. 
. j II. Yellow shading into red. 
S 1^12. Crimson. 
”2 I 13- 
14. 
Light blue, very little. 
Green, very broad. 
Crimson fainter than 12. 
16. Green, very broad. 
17. Faint blue. 
18. Faint crimson. 
19. Very faint blue. 
O ‘ 20. Very faint crimson. 
> I 
'S I 
^-5 I 
> L 
21. Still fainter blue. 
22. Still fainter crimson. 
