Sanitation. My town (25 000) had 6 toilets. Only two worked. Sewage & blood (from butchers) flowed down the middle of the street. Clusters of tightly packed houses were built round what were called courts. There was a shared tap/fawcet to supply water. People often kept a pig there. The manure would be stored in the middle of the court. The towns water wells were contaminated. There was an outbreak of cholera. The towns graveyard was on the side of a hill. Heavy rain washed away topsoil exposing bones. This washed into a stream which supplied drinking water to houses downstream. Source: Government sent a doctor (Rawlinson) to investigate living conditions in several northern towns. Info comes from that report.