According to Hájí Mu’inu’s-Saltanih’s narrative (p. 37), the
Báb assumed, at the age of twenty, the independent direction of His business
affairs. “Orphaned at an early age, he was placed under the tutelage of his
maternal uncle, Áqá Siyyid ‘Alí, under whose direction he entered the same
trade in which his father had been engaged (that is to say, the mercantile
business).” (A. L. M. Nicolas’ “Siyyid ‘Alí-Muhammad dit le Báb,” p. 189.)
(Footnotes to Chapter 3 of ‘The Dawn-Breakers’, provided by Shoghi Effendi)