Unpublished letter, on the quadrature of the circle from Mark Roworth to the Secretary of the Royal Society Roworth introduces his paper on the quadrature of the circle and asks that it be presented to the Royal Society. He defends his method of finding the quadrature and acknowledges that it is different than other more commonly proposed methods. Subject: Mathematics Written by Roworth in Patna [Bihar, India]. 5 April 1825