Über zellfreie und zelluläre Gewebsschranken in neuer Sidit

This is an attempt to classify all well known tissue barriers which are built by the cells against each other, and to interprete them genetically. Since the barriers are cutting off certain cell influences, general exchange of information must have been the case before. The germ cells were not excluded from this information exchange. This gives a complete new and concrete base to the possibility of a time-limited heredity of aquired characters.