After the experience of the black death, some sanitary measures were taken. The notorious offenders in matters of public hygiene in the towns, such as the butchers, the fishmongers, and the leather tanners were assigned specific localities where their trades would do least harm. The smiths and potters were excluded from the more densely populated areas because they were fire risks. In the town of Salisbury, there was Butcher Row, Ox Row, Fish Row, Ironmongers' Row, Wheelwrights' Row, Smiths' Row, Pot Row, Silver Street, Cheese Market, and Wool Market. For water, most communities depended on rivers that ran near by or on public wells that were dug to reach the water underground. Some towns had water public water supply systems. Fresh water was brought into the town from a spring or pond above the town by wood or lead pipes or open conduits. Sometimes tree trunks were hollowed out and tapered at the ends to fit into the funnel-shaped end of another. But they leaked a lot. In London, a conduit piped water underground to a lead tank, from which it was delivered to the public by means of pipes and brass taps in the stone framework. This was London's chief water supply. Water carriers carried water in wooden devices on their backs to houses. The paving and proper drainage of the streets became a town concern. Building contracts began specifying the provision of adequate cesspits for the privies at town houses, whether the latrines were built into the house or as an outhouse. Also, in the better houses, there grew a practice of carting human and animal fecal matter at night to dung heaps outside the city walls. There was one public latrine in each ward and about twelve dung carts for the whole city. Country manor houses had latrines on the ground floor and/or the basement level. In London, the Goldsmiths, Merchant Taylors [Tailors], Skinners, and Girdlers bought royal charters, which recognized their power of self-government as a company and their power to enforce their standards, perhaps throughout the country. The Goldsmiths, the Mercers, and the Saddlers became in 1394 the first guilds to receive charters of incorporation, which gave them perpetual existence. As such they could hold land in "mortmain" [dead hand], thus depriving the king of rights that came to him on the death of a tenant-in-chief. They were authorized to bestow livery on their members and were called Livery Companies. The liverymen [freemen] of the trading companies elected London's representatives to Parliament.