of Edinburgh, Session 1885-86. 
509 
size varied very much ; at times the two sets of colours merged into 
one misty corona which shrank rapidly in, a new second set forming 
outside as the former one contracted. 
Nov. 22, 1885. — Lunar corona formed on high cirro-cumulus 
clouds at 19 h and 20 h ; colours as in diagram, but 
very badly defined. At 19 h red very broad. Radius 
to inside of this red, 1° 54'; radius to outside of this 
red, 4° 18'. At 20 h colours better marked a little, hut 
still vague. Radius of red, 2° 54' ; radius of yellow, 
2° 35' ; radius of outside of blue, 1° 42'. Blue much broader than 
the red or yellow, and with no defined inner margin. 
Pale red 
Yellow 
Bluish 
white 
Nov. 23, 1885. — Double lunar corona on cirro- 
cumulus at 4 h . Badly defined, but coloured as in 
diagram. Radius of outer red, 6° 48' ; radius of inner 
red, 3° 7' ; radius of yellow, 2° 42'. 
line ; green a broad belt. 
Yellow a narrow 
Red 
Green 
Red 
Yellow 
Bluish 
D 
Red 
Yellow 
Blue green 
Red 
Yellow 
Watery 
yellow 
Dec. 16, 1885. — Double lunar corona at 20 h ; 
colours as in diagram ; the outer yellow very faint. 
Formed on scud ; no corona visible when scud clears off. 
Radius of outer red, 3° 48' ; radius of inner red, 1° 58' ; 
radius of outer yellow, 3° 38' ; radius of inner yellow, 
less than 1° 40'. Similar corona at 22 h . When the ^ 
scud got very thick the outer part was more yellow and less blue 
looking. Radius of outer red, 3° 33'; radius of inner red, 1° 53'; 
radius of outer yellow, 3° O'; radius of inner yellow, 1° 23'. Two 
minutes after — outer red, 3° 8' ; inner red, 1° 42'. Yery faint traces 
of third ring at times. 
Dec. 18, 1885. — At ll h solar halo, white. Yery faint except in 
one spot to eastward of sun (horizontally). Radius = 23° 3'. 
Dec. 19, 1885. — At 3 h faint blue lunar corona; radius, 3° 4'. 
The edge of this corona was the brightest part, but the whole space 
inside was blue, and no other colour was visible. At 4 h similar 
corona, but with very faint red edge outside. Radius = 3° 20'. At 
17 h lunar corona; red outside. Radius to outside of red = 4° 13'; 
to inside of blue, 2° 55'. 
