Finger-Sucking in Children, Germany, 20th century

Typescript letter, signed in pencil, from E. Zinner, dentist, to the Superintendent of the Jewish Runaway/Refugee Children's Home (J?discher Kinderfl?chtlingsheim), Berlin, on methods of preventing children from sucking their fingers. Signed "Mit deutschem Gru?", presumably to display patriotism without offending the Jewish recipient by writing "Heil Hitler". 1 sheet (1935).