Yick Wo v. Hopkins Ordinance:

Order No. 1587, passed July 28, 1880, the following section:

"SEC. 68. It shall be unlawful, from and after the passage of this order, for any person or persons to establish, maintain, or carry on a laundry within the corporate limits of the city and county of San Francisco without having first obtained the consent of the board of supervisors, except the same be located in a building constructed either of brick or stone."