Further/Farther
I'm actually really curious about this and need to look into when and where this rule sprung up.
The reason I say this is that countless, countless, countless British Victorian novels consistently use "further" for "farther." Which makes me inclined to say it's either an American rule, or one that wasn't created until after that era. In which latter case it might simply be Tolkien deliberately evoking an older feeling, or simply not being aware of the newer rule as he was steeped in older culture (of course, if he knew, I have the feeling he'd deliberately ignore it).
Consequently when I encounter "further" for "farther" in my reading I like to think of it as a construction along the lines of "I should like" for "I would like"--something that is deliberately and delightfully British.
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