Robert Seymour depicts cholera as a robed, skeletal creature emanating a deadly black cloud. The<unk>  (also called the<unk> tic<unk>  is an obsolete medical<unk>  that held that diseases—such as cholera, chlamydia, or the Black Death—were caused by a<unk>  (, Ancient Greek for 'pollution'), a noxious form of "bad air", also known as night air. The<unk>  held that epidemics were caused by<unk> , emanating from rotting organic matter. Though<unk>  is typically associated with the spread of contagious diseases, some academics in the early nineteenth century suggested that the<unk>  extended to other conditions as well, e.g. one could become obese by inhaling the odor of food. The<unk>  was advanced by Hippocrates in the fourth century B.C. and accepted from ancient times in Europe and China. The<unk>  was eventually abandoned by scientists and physicians after 1880, replaced by the germ<unk>  of disease: specific germs, not<unk> , caused specific diseases. However, cultural beliefs about getting rid of odor made the clean-up of waste a high priority for cities.
Miasma theory
Spoon theory
Refrigerator mother theory
Bobath concept
Culture of violence theory
Biosocial theory
Bead theory
Kindling model