A public "Fruentimmer", meaning a woman, refers to a prostitute.
The police was allowed to warn women tree times if they were being suspected for prostitution. However, if she kept herself "in a profession that dealt with fonication", she would be registered as a "public Fruentimmer".
By 1874, people were concerned about the spread of venereal infections. The police where hereafter allowed to register the prositutes. Registered women were obligated to undergo examination by the divisional surgeon twice a week - and comply with certain rules. If they did not respect the regularities, they could get punished with jailtime or forced work.
The law was lifted in 1906.