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the astronomer, at Copenhagen, in 1872, he
was presented by D’Arrest with one of sev-
eral bricks collected from the ruins of Urani-
borg. This was one of his most cherished
possessions until, on returning home after
a prolonged absence on astronomical work,
he found that his treasure had been tidied
away from his study.
[2] An ellipse is one of the plane, sections
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