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seventh satellites of Jupiter, have been fol-
lowed regularly in their courses at Green-
wich ever since their discovery with the thirty-
inch reflector (erected in 1897); and while
doing so Mr. Melotte made, in 1908, the
splendid discovery on some of the photo-
graphic plates of an eighth satellite of Jupiter,
at an enormous distance from the planet.
From observations in the early part of 1908,
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