Categories: Alternative conceptions
An example of a historical scientific idea that would now be considered an alternative conception:
"In incandescent gases certain electrons take on an oscillatory motion of very high frequency; the displacements are very small, the velocities finite, and the accelerations very great; the energy is then communicated to the ether, and it is for this reason that these gases radiate light of the same periodicity as the oscillations of the electron."
Henri Poincaré (1914) Science and Method (trans. Francis Maitland) Dover Publications, 1952.