Cowsheds , slaughter houses , and grease - boiling dens lined the streets .
Cowsheds , slaughter houses , and grease - boiling dens contributed animal droppings , rotting fluids and other contaminants to the primitive Soho sewer system .
Cowsheds , slaughter houses , and grease - boiling dens lined the streets and contributed animal droppings , rotting fluids and other contaminants to the primitive Soho sewer system .