| Description | Two booklets. Offprints of "Rod and Cone Receptor Mechanisms in Typical and Atypical Congenital Achromatopsia" by H R Blackwell and O M Blackwell, reprinted from 'Vision Research', vol. 1, numbers 1/2, (1961); and "Neural Theories of Simple Visual Discriminations" by H Richard Blackwell, reprinted from 'Journal of the Optical Society of America', vol. 53, no. 1, (Jan 1963). Offprints have been annotated by Smith. |