Although I found the article at RealClearScience, “Five Elements and Substances That Turned Out Not to Exist”, interesting and informative, after reading it I was surprised to find that the author failed to include the best known example of a substance that didn’t exist: the ether.
But, but, but…….the science was settled….
BTW. Did the author respond to you?
No. No response. I didn’t expect one.
I would have to include “Inorganic food”