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I found it. It's from Encyclopaedia Perthensis; or Universal dictionary of the arts, written in 1816. You can get to it through Google Books.



This is not meant to contradict Neil, who sounds...

I read somewhere in an old geological textbook (I'll try to track it down) that the Water of Ayr stone consists of petrified wood.

As is always the case with discussions of "Water of Ayr" stones,...