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were neither more sure nor further-reaching;
and as to the character of the reasoning,
it was of a decidedly less vigorous and
fecund kind than that of Plato himself.
As for the science of logic, if remained
substantially the very doctrine that
Aristotle had taught.

Galileo inaugurated the science of
dynamics about 1590, and his work was
well-known and had its effect, although
his book was not published for near half
a century later; and it was the study of
dynamics, more than anything else,
which gradually taught men to reason
better on all subjects. I do not say that
it was the sole cause; for Tycho Brahe
established his observatory half a dozen
years before Galileo was appointed professor
in Pisa; and the principle of our system of