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Professor von Tschermak, a Hofrat of the old Austrian Empire and renowned teacher of physiology for the last fifty years, belongs, with Professor Brückner, of Basel, and the elder Dr. Burian, to the last surviving pupils of the great Ewald Hering. At least as the originator of the Tschermak test (the after-image test for retinal correspondence, suggested by Hering himself), he is known to every ophthalmologist. His description of the phenomenon of anomalous sensorial relationship in squint (von Tschermak is a squinter himself) is common knowledge today. At the age of almost 78, forced to leave Prague as a German national, and reinstated as a professor of physiology at the newly founded extension of the badly damaged University of Munich in Regensburg, in the American zone of Bavaria, Professor von Tschermak has written a short introduction to "Physiologic Optics," the reading of which will be both a gain and a