For many years the police returns of the city proper would show about five hundred of the registered "common women" (_eingeschrieben Dirnen_), and one hundred registered brothels. The police regulations requiring monthly payment of the personal and house tax, and also a renewal of the permission to keep brothels at the same time, is a very convenient method of obtaining a census of the class. The following is a statement of the largest and smallest monthly number of registered women for several years: Year 1883 Largest number, 550 Smallest number, 456 " 1834 " " 550 " " 450 " 1835 " " 481 " " 441 " 1836 " " 546 " " 473 " 1837 " " 514 " " 484 " 1844 " " 502 No reports. " 1846 " " 512 No reports. These monthly reports do not show any marked variation at any particular period, the rise and fall being arbitrary. The fluctuation is not very great in the aggregate, although from November, 1834, to January, 1835, there was a decrease of 86 (or nearly one fifth), while between November, 1835, and January, 1836, there was a corresponding increase. Since that time the numbers have remained steadily at about one point. The housekeepers' (_bordelwirth_) return does not vary to the same extent. The average is 105 But it decreased in 1844 to 90 " " " 1845 " 93 " " " 1846 " 96 Of these housekeepers in the last-named year (1846) there were Males 60 Females 36--96 In December, 1844, there were Registered women 502 who were subdivided into those Living in registered houses 294 Living privately 208--502 In May, 1845, there were Registered women 505 who were subdivided into those Living in registered houses 326 Living privately 179--505 (At this period there were four registered houses without any women in them.) In August, 1846, there were Registered women 512 who were subdivided into those Living in registered houses 334 Living privately 178--512 These figures show that the number of those living privately is gradually diminishing, more of them being concentrated in the registered houses. Dr. Lippert is of opinion that prostitution decreases in the summer and increases in the winter months. The statistics will certainly support this theory, but the difference is so small as scarcely to warrant its reception as a rule.