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second (Mimas and Encelades) were added
by Herschel in 1789, and the seventh (Hy-
perion) simultaneously by Lassel and Bond
in 1848. The ninth (Phoebe) was found on
photographs, by Pickering in 1898, with ret-
rograde motion; and he has lately added a
tenth.
The occasional disappearance of Cassini’s
Japetus was found on investigation to be
536