Copy letters to and from John Louis William Thudichum Copy letters of correspondence between Johann Ludwig Wilhelm Thudichum and Professor Justus von Liebeg, Professor Friedrich von Esmarch, Professor Eduard Friedrich Wilhelm Pfluger and Professor Rudolph Virchow. Also contains a later letter from Thudichum's daughter, Marie L. Thudichum to Dr. Max Leonard Rosenheim, FRS. 1864-1933