The Phlogiston Theory – Wonderfully wrong but fantastically fruitful
thonyc.wordpress.com
thonyc.wordpress.com
[0] http://chem.tufts.edu/answersinscience/relativityofwrong.htm
We now know that it goes out because the reaction runs out of combustible oxygen. Since according to Phlogiston theory combustion involved a substance called Phlogiston being given off , they reasoned the candle went out because a given volume of air could only hold a given amount of Phlogiston.
They even tried to calculate the "maximum capacity of phlogisticated air".
However they weren't entirely wrong they just got it backwards. Phlogiston is basically minus oxygen. :) . So it spurred research in the right direction and eventually got us to the "more correct" explanation.
https://www.youtube.com/watch?v=DZTD-vYhwj4
See also the sequel (on the luminiferous aether):
Dark Energy and Dark Matter are two such examples. They're just keeping the seat warm until we actually have an idea what the hell is going on.
A particularly long lived example was the heredity placeholder in Darwinian evolution that survived nearly a century before Rosalind Franklin et al., finally filled in the gaps.
"Gnu Atheists is a pun on the label New Atheists that quickly took on a life of its own. As a pun, it is equivalent in meaning to New Atheists, and the two can be substituted for each other anywhere they occur."