40 M. Mitchell—Observations on Jupiter and its Satellites. 
1875, June 2.—Observations began at 7°55" p. M. A very 
remarkable white spot was at once seen, nearly at the center of 
Jupiter’s disc. It was followed by a very dark shading, so 
that it strongly resembled a satellite and shadow in transit. 
The white spot was so well defined as to be easily measured. 
ve escisa'g diameter (oblique to equatorial belt) was 1’'°7. 
. . the white spot was approaching the limb of the 
tess stnidag a es with the planet, and was followed 
y one ate and less distinet. 
5, —Observations began at 7° 30" P. M. At 
Ya oa no Petites spot could be seen. At 3 15™ the white spot 
with the _ appearance of shadow eee could be 
seen, as on June 2. It was, at this time, 4 of t iameter of 
Jupiter, distant from the following limb. At gh 15™ the sec- 
ond white spot was seen, following the first, as on June 2. 
The 1st satellite touched the limb of Jupiter at 8" 21™ 24* Pp. M. 
The internal contact was at 8" 26™ 19° p. m. The satellite 
entered upon the planet below the broad belt, very white, 
more brilliant than the spot, but smaller and scarcely more 
conspicuous. The vipa 3 of the satellite was first seen upon 
the disc at 9° 23™ . M. 
1876, May 30. LOBbertaons began at 9" 39" p. Mm. The 
broad belt on the dise of J upiter was mostly above the equator. 
lt was mottled with large white spots, somewhat rose-tinged. 
th 1st satellite as it approached the planet was of a dazzling 
whiteness; it entered upon the disc above the lower margin of 
the equatorial belt, yet it could be seen for only twelve min- 
utes. The shadow entered on the disc about sixteen minutes 
later very black, but not round, the longer diameter bein 
=~ a perpendicular to equatorial belt. 1st satellite touched 
limb of . at 9" 538™ 26° Pp. M.; was at internal contact 
. 59™ 22°. ‘The shadow was wholly on the disc at 10" 15™ 128 
ca The satellite was seen at 10° 11™ 32*p.m. It is poets 
that the satellite was faintly seen at 10° 34™ 2°. 
1876, May 31.—The peculiarity in the appearance of Jupiter 
is the presence of bright white spots on the upper portion of 
the disc, markings resembling facule on the he first 
satellite was seen to come out of eclipse at 9" 44™ 41°-99. 
1876, June 15.—Observations on Jupiter began at 8" 20™ P. M. 
The first satellite was known to be in transit, but could not be 
seen upon the disc. The shadow of the Ist satellite was 
wholly within the limb at 9" 34" 51°9. At 9" 55™ 36°9 the 
3d satellite was seen to come out from eccultation. At 9" 58” 
11*-9 the 3d satellite was wholly out and shining with brilliant 
white light. At 9" 20™ 42° the Ist satellite was found, a 
ing the preceding limb, a dull gray figure, elliptic in shape, the 
major axis being perpe equatorial belt. When this 
