considerable artistic power, which he cultivated diligently. Indeed,
it would seem that for some time the future astronomer entertained
the idea of devoting himself to painting as a profession. His
father, however, decided that he should study medicine. Accordingly,
we find that when Galileo was seventeen years of age, and had added a
knowledge of Greek and Latin to his acquaintance with the fine arts,
he was duly entered at the University of Pisa.

Here the young philosopher obtained some inkling of mathematics,
whereupon he became so much interested in this branch of science,
that he begged to be allowed to study geometry. In compliance with
his request, his father permitted a tutor to be engaged for this
purpose; but he did so with reluctance, fearing that the attention of
the young student might thus be withdrawn from that medical work
which was regarded as his primary occupation. The event speedily
proved that these anxieties were not without some justification. The
propositions of Euclid proved so engrossing to Galileo that it was
thought wise to avoid further distraction by terminating the
mathematical tutor's engagement. But it was too late for the desired
end to be attained. Galileo had now made such progress that he was
able to continue his geometrical studies by himself. Presently he
advanced to that famous 47th proposition which won his lively
admiration, and on he went until he had mastered the six books of
Euclid, which was a considerable achievement for those days.

The diligence and brilliance of the young student at Pisa did not,
however, bring him much credit with the University authorities. In
those days the doctrines of Aristotle were regarded as the embodiment
of all human wisdom in natural science as well as in everything
else. It was regarded as the duty of every student to learn