The 1879 Act, though well-intentioned, was an even worse failure than the1867 Act. Tenement dwellers tossed garbage, bilge water and waste into these air shafts which were not designed for garbage removal. As a result, the law's attempt to improve sanitation only created a new sanitation problem. Worse, the air shaft acted as a flue spreading fire from apartment to apartment. The 1901 law did away with the air shaft, replacing it with the large courtyard for garbage storage and removal. In later structures, the introduction of elevators reduced garbage defenestration by upper-story tenants.