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pleased with this device, and adapted it to
his own system.
[7] Hist. Ast. , vol. i., p. 354.
[8] Hist. of Phys. Ast. , p. vii.
[9] ”Est enim Astronomi proprium, his-
toriam motuum coelestium diligenti et arti-
ficiosa observatione colligere. Deinde causas
earundem, seu hypotheses, cum veras as-
sequi nulla ratione possit ... Neque enim
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