When did the word "ecology" enter into general use?

Cite? :dubious:

From the OED

So, Thoreau did NOT use the word

I would’ve cited if I’d remembered. I read it some years ago, from a reliable source.

Make that a formerly reliable source.

Kind of like “the Source Formerly Known as Reliable”?

Thanks, samclem, I’m relieved. I like to be corrected if need be. I’m usually critical about sources and I thought this one was reliable. :o