Letter

Abstract

All workers on colour vision will, I am sure, welcome Dr. Karplus' letter, especially for the historical notes on the dispute between Koenig and Hering. It is quite evident from this that the dichromatism of the central fovea, when reported by Koenig fifty years ago, was the subject of some heated discussion; at the same time, when Willmer¹ re-discovered the effect in 1944, it is probably true to say that most workers in the subject had either ignored or were ignorant of both Koenig's results and Hering's discussion of them, and I would have to admit to being among that number. No doubt there were exceptions, and Dr. Karplus is certainly one honourable example; but then I understand that he had the great privilege of working under Koenig in his laboratory—a privilege that may well be unique among those alive to-day.