On the Physical Appearance of the Planet Jupiter. 229 
just emerging from the planet’s disc (the satellite too small in the drawing). S, 
reddish brown, nothing particular seen on it; a, b, d, grey; b interrupted as in 
drawing; c in very strong relief, its lower edge (4) as always (also in the preceding 
drawings, though not specially mentioned) very bright. The sketch is not quite 
finished, prevented by rain. 
1880, December 1. 
No. 20.—L.=286°.52. T.=7h. 43m. 
Definition from the middle of the sketching splendid. Southern edge of a very 
bright. S, red, just appearing ; 0, grey, its foll. parts next to the central meridian a 
little too dark ; c, reddish brown, northern edge very bright. I thought to see two 
bright lines in the north prec. part of the dise. 
No. 21.-—L.=296°.09. T.=8h. Om. 
Definition worse, but afterwards better; b, uniformly dark. The foll. cloud in 3, 
preceding the red spot, very bright; c, uniformly dark. 
No. 23.—L.=304°.80. T.=8h. 14m, 
Not quite finished ; the clock ran down; S, decidedly red. 
No. 1.—L,=1°.38. T.=9h. 48m. 
Definition bad; the small mirror was found to be covered with dew and hoar 
frost ; s and c reddish brown; the northern edge of c (4) very bright. I have not 
much confidence in the following parts of 3. 
1880, December 16. 
No. 7.—L.=75°.50. T. 9h. 8m. 
Definition middling. Southern edge of a bright; b, almost as dark as ¢ ; ¢, reddish; 
d, faint. 
No. 8.—L.=84°.21. T.=9h. 23m. 
Definition very good, moments of an extraordinary clearness. Southern edge 
of @ bright; b, uniformly dark; c, decidedly reddish, northern edge of ¢ very bright; 
é visible. 
No. 10.—L.=96°.40. T. 9h. 43m. 
Southern edge of a very bright. The following parts of d rather faint ; e visible. 
No, 11—L.=111°19. T.=10h. 7m. 
b, in the following part interrupted as shown in the drawing; not quite finished ; 
clock ran down. 
No. 14.—L.=132°09. T.=10h. 42m. 
Very clear. a, very indistinctly visible; in the place of interruption in 6 I 
sometimes thought I saw a very faint continuation of ¢; southern edge of ¢ a very 
small line, northera one very bright. 
1881, January 7. 
No. 9.—L.=87°.79. T.=7h. 34m. 
Definition not good, slight fog and moonlight; b and ¢, reddish grey, no special 
difference of colour perceptible. 
