Unpublished letter, 'On some general expressions for the limits of functions' from [Francisco de Borja Garção] Stockler to T [Thomas] Young Stockler addresses the problem of a rule to define the limits of algorithmic functions. A graphite inscription on the covering page reads 'not in Proc [Proceedings]'. Subject: Mathematics Written by Stockler in Rio de Janeiro [Brazil]. Read to the Royal Society on 29 June 1820. 25 February 1820