Prof. N. Oppenheim. To the doctrine of the periodicity of certain symptoms in nervous diseases. Neurologisches Centralblatt No. I—1908)

The author draws attention to the well-known fact that nervous diseases of various types tend periodically and sometimes with remarkable regularity, at certain more or less intervals of time, to appear with particular intensity. This fact has been of interest to the author for several years, and he is trying to put it forward, to put it in line for development and discussion, without trying, on his part, to offer any theory or hypothesis for explanation.