Tscherning's New Theory Of Accommodation.
Paris, Feb. 22, 1894. Dear Doctor: —I have been told by Dr. Javal and others that Tscherning's theory of accommodation has not yet been published in the English language, inasmuch as it has just appeared for the first time in the Archives de Physiologie , published in Paris. I therefore thought that it might be of interest to the medical profession in America. I shall not undertake to give a complete exposition of this theory, but only a brief resume of its most important features. I will say, however, that the conclusions to which Dr. Tscherning has arrived have been the outgrowth of a vast deal of very careful study in the laboratory of Javal in the Sorbonne, and from my limited personal acquaintance with him I would judge that his inquiries have been conducted in the proper spirit of scientific investigation. His numerous experiments on the lower animals and his