"The proof that π is a transcental number will forerver mark an epoch in mathematical science. It gives the final answer to the problem of squaring the circle and settles this vexed question once for all. This problem requires to derive the number π by a finite number of elementary geometrical processes, i.e. with the use of the ruler and compasses alone."
Lectures on Mathematics delivered from Aug. 28 to Sept. 9, 1893 at Northwestern University, p. 52.
dgoldsmith