**Simson, Robert**, mathematician, born in Ayrshire; abandoned his
intention of entering the Church and devoted himself to the congenial
study of mathematics, of which he became professor in the old university
at Glasgow (1711), a position he held for 50 years; was the author of the
well-known “Elements of Euclid,” but is most celebrated as the first
restorer of Euclid's lost treatise on “Porisms” (1687‒1768).

Definition taken from
*The Nuttall Encyclopædia*,
edited by the Reverend James Wood (1907)