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to really great men put him in the way of
originating a new branch of astronomy.
The laws of motion had not been cor-
rectly defined. The only man of Galileo’s
time who seems to have worked successfully
in the same direction as himself was that
Admirable Crichton of the Italians, Leonardo
da Vinci. Galileo cleared the ground. It
had always been noticed that things tend
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