subtle difference between subtlety and subtility.

[Jim Newton]

I'm originally from Mississippi, where there are some interesting archaic forms still in usage which have (unfortunately) vanished in much of the English speaking world.
I just realised that "subtlity" with a clearly pronounced B, is such an archaic form.
It's the form I've always used, at least in spoken english. As my spell checker was refusing
to recognize it, I looked it up :

http://dictionary.reference.com/browse/subtility

It appears to be an archaic form of subtlety.

Sigh :-(

[pensive hamster]

I live in the UK, and I've never been to Mississippi. And I've never
previously heard "subtlity", or "subtility" either.

"Subtility" suggests a sub-standard utility company, like an electrical
power generating company that only manages to produce electricity
a couple of days a week.

Though I can imagine somebody coming across the word "subtlety"
for the first time, pronouncing it "subtlity" with a clearly pronounced B.

Do Americans do subtlety? Perhaps they don't have much use for the
word, and it is but rarely encountered Over There?

[Jerry Friedman]

We mostly use it about Wily Foreigners.

--
Jerry Friedman