"Stiles [W S] - Crawford" Photocopied articles, annotated by Smith, comprising: "Luminous Efficiency of Rays entering the Eye Pupil at Different Points" by W H Stiles and B H Crawford, in 'Nature', vol. 139, (6 February 1937); "The directional sensitivity of the retina and the spectral sensitivities of the rods and cones" by W S Stiles, in 'Proceedings of the Royal Society, Series B', vol. 127, number 846, (1939); "The Directional and Spectral Sensitivities of the Retinal Rods to Adapting Fields of Different Wave-Lengths" by Françoise Flamant and W S Stiles, in 'Journal of Physiology', vol. 107, (1948); ms notes and figures by Smith on tracing paper; part [pp.337-350] of "Colour change of monochromatic light with retinal angle of incidence" by J M Enoch and W S Stiles, in 'Optica Acta', vol. 8, issue 4, (1961). 1937-1961