An example of a historical scientific theory since discredited, which would now be considered an alternative conception:
"marsh-miasma. From The Century Dictionary: noun Miasma from marshes or boggy spots; the infectious vapors which arise from certain marshes and marshy soils, and produce intermittent and remittent fevers."
Definition from the website 'w❤️rdnik'
The website does not point out that The Century Dictionary was published in various forms from 1889 to 1909 (and originally based on an 1841 publication).
