Good old Hariot (Raleigh's mathematical tutor, whom he sent to Virginia) re-echoes his pupil's trumpet-blast.

I remember my first mathematical tutor once said to me, 'If you would know anything, begin by doubting everything.'

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.

He will therefore accompany me to Font Abbey to-morrow, and I must contrive somehow or other to find him a mathematical tutor in the neighborhood.