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M. Mitchell— Observations on Jupiter and its Satellites. 455 
1872, March 1. The 1st satellite was seen to come out of 
the shadow at 6" 49™ 9*-9, 
1872, March 7. The 1st satellite seemed to touch the limb, 
in transit at 7" 13" 51*-6, was wholly on the disc at 7" 19™ 0*-6 ; 
after which it was seen for only ten minutes. 
1872, March 16. Three dark spots were seen upon the prin- 
cipal belt, larger and as dark as the shadow of the Ist satellite, 
which was also on the planet’s surface. The shadow seem 
to become smaller and more distinct as it approached the limb; 
it was last seen at 7" 56™ 36°88. By measurement the diame- 
ter of the shadow of the satellite was larger than that of the 
satellite. The 3d satellite was free from spots. 
1878, Jan. 19. Observations on Jupiter began at 8" 30™ P. M. 
The 8d satellite was known to be in transit, but could not be 
seen until it had passed the center of its path. It was then an 
regular dark spot. It became more round and well defined 
and again indistinct, although there were no perceptible changes 
of light and shade on the disc of the planet, and the air was 
steadily improving. : 
1873, Feb. 4. At a little after 9 p. mM. the 4th satellite was 
seen on the disc of Jupiter as a brownish-gray marking, not 
far from the preceding limb. It was lost for a time, but re- 
appeared when near the limb. Like the other satellites in that 
position, it showed a disc similar to that of the moon seen 
through mist. It was first seen to protrude beyond limb at 
9" 85™ 45°20; was wholly off at 9° 38" 31°20. Th 3d satel- 
lite, shining far from Jupiter, showed a dise irregular in sha 
nd hazy in outline. The broad belt of Jupiter was slightly 
reddish. — 
18738, Feb. 17. Observations began at 7" 382". The shadow 
of the Ist satellite could be seen, thrown upon the planet, it 
was not round, but elongated in a direction perpendicular 
pens, the satellite was seen round and snowy white a few min- 
utes before it left the disc; it was much whiter than Jupiter. 
ey satellite was wholly off at 8" 47™ 42°53; shadow last seen 
52™ O08 
1873, Feb. 25. The 2d satellite was occulted at ge 49™ 52*-6. 
1873, March 11. Jupiter was seen between flying clouds, 
but the seeing was excellent. A faint rosy tinge could be seen 
on the upper part of the broad equatorial belt, on which there 
was a large white spot. The 3d and 4th satellites showed dis- 
tinct discs; that of the 3d was ruddy in color. The Ist satel- 
lite was occulted. It touched the limb at 8” 46" 23°1; was 
bisected by the limb at 8" 48" 17°-1 ; was last seen at 8"51™ 23°-6. 
1873, Macch 18. Seeing excellent. Four lines in the broad 
belt were strongly marked, but no rosy tinge could be per- 
