Sir: Bill Bryson is baffled by some of the words thrown up by his computer spell-checker (Bryson's America, 12 July). "Internat" exists in French and German, and means "boarding school". What it's doing on his spell-checker, I cannot imagine. "Falx", as I'm sure you know, is "the sickle-shaped fold of the dura mater on the midline of the brain between the cerebral hemispheres". Alas, I can find no trace of "phose". Any offers?