Grocers sold herbs for medicinal as well as eating purposes. Breadcarts sold penny wheat loaves. Foreigners set up stalls on certain days of the week to sell meat, canvas, linen, cloth, ironmongery, and lead. There were great houses, churches, monasteries, inns, guildhalls, warehouses, and the King's Beam for weighing wool to be exported. The Mercers and Goldsmiths were in the prosperous part of town. The Goldsmiths' shops sold gold and silver plate, jewels, rings, water pitchers, drinking goblets, basins to hold water for the hands, and covered saltcellars. The grain market was on Cornhill. Halfway up the street, there was a supply of water which had been brought up in pipes. On the top was a cage where riotous folk had been incarcerated by the night watch and the stocks and pillory, where fraudulent schemers were exposed to ridicule. Outside the London city walls were tenements, Smithfield cattle market, Westminster Hall, green fields of crops, and some marsh land. On the Thames River to London were large ships with cargos; small boats rowed by tough boatmen offering passage for a penny; small private barges of great men with carved wood, gay banners, and oarsmen with velvet gowns; the banks covered with masts and tackle; the nineteen arch London Bridge supporting a street of shops and houses and a drawbridge in the middle; quays; warehouses, and great cranes lifting bales from ship to wharf. Merchant guilds which imported or exported each had their own wharves and warehouses. Downstream, pirates hung on gallows at the low-water mark to remain until three tides had overflowed their bodies. The large scale of London trade promoted the specialization of the manufacturer versus the merchant versus the shipper. Merchants had enough wealth to make loans to the government or for new commercial enterprises. Some London merchants were knighted by the King. Many bought country estates and turned themselves into gentry. In schools, there was a renaissance of learning from original sources of knowledge written in Greek and rebirth of the Greek pursuit of the truth and scientific spirit of inquiry. There was a striking increase in the number of schools founded by wealthy merchants or town guilds. Merchants tended to send their sons to private boarding schools, instead of having them tutored at home as did the nobility. Well-to-do parents still sent sons to live in the house of some noble to serve them as pages in return for being educated with the noble's son by the household priest. They often wore their master's coat of arms and became their squires as part of their knightly education. At the universities, the bachelor's degree came into existence to denote a preliminary stage in the course of becoming a master.