By the beginning of the 18th century, life in the city of Edinburgh (today's Old Town) was overcrowded and unsanitary.
Before this was recognized, Edinburgh suffered from a series of debilitating diseases.
mnli hypothesis: Before this was recognized, Edinburgh suffered from a series of debilitating diseases. premise: By the beginning of the 18th century, life in the city of Edinburgh (today's Old Town) was overcrowded and unsanitary.