Unpublished letter, 'The theory of vision [part 2]' from W F [William Ford] Stevenson to Samuel Hunter Christie Stevenson attends another lecture by [Dominique Francois Jean] Arago, this time on the doctrine that 'we arrive at a correct vision only by education'. Stevenson shares his thoughts on what this means for his previous letter in which he stated that objects are not presented to the mind as they are found upon the retina, but in the actual position in which are are placed before the spectator. Subject: Vision / Optometry Received 18 March 1845. Written by Stevenson at Hôtel Meurice, Paris. 15 March 1845