Barleywine
Yes, and cold and dry equals Earth. This is not to say that other attributions don't make any sense. Many things in occultism are a matter of perspective, and Mercury is always the oddball.
Yes, the oddball, that's a good way to put it. Although I don't use the more modern (trans-Saturnian) planets for much these days, and take issue with some of the qualities assigned to them, considering Uranus a "higher octave" of Mercury does make some sense in this regard.