Proceedings of Royal Society of Edinburgh. modation, and he gave precision to the optical methods for ascertaining and estimating anomalies of refraction. In all of these researches he not only showed himself to be an able mathematician and physicist, but he enlisted the interest of the medical profession at large by the careful clinical records given of individual cases suffering from anomalies of vision, and by the ingenuity and efficiency of the means devised for their relief. Donders also

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... ntributed papers on Physiological Time in Psychical Processes, the Nature of Vowel-Tones, Speech, and the Cardiac Sounds. All his writings are characterised by exactitude of statement, facility in illustration, and graceful diction. The subject is always treated with the hand of a master. Of commanding stature, a dignified presence, a large Apollo-like head with a luxuriant wealth of hair, dark somewhat rugged features, and eyes that sparkled with the lustre of genius, Donders was a man whose personality is not likely soon to fade from the memory. Eminent among physiologists, chief among oculists, a great teacher, and a good citizen, his life-work is thus summed up by his friend Moleschott:-"Of him it would be difficult to pronounce whether he was greater or more prolific as an investigator, or clearer or more effective as an expositor, or, lastly, more duteous and helpful as a healer of that organ which is the portal of wisdom and love."