Paper, 'A trichromic case of colour blindness' by F W [Frederick William] Edridge-Green Edridge-Green presents the case study of J C, a 33-year-old man who 'saw three colours in a bright solar spectrum, red, green and violet. The orange and yellow, he saw not as definite colours but as mixtures of red and green.' Annotations in ink throughout. Subject: Physiology / Ophthalmology Received 17 October 1900. Communicated by [Arthur William] Rücker. A version of this paper was published in volume 76 of the Proceedings of the Royal Society as 'Two cases of trichromic vision'. 1900