Probably any kid back in the 40s in a strict British school that favoured wordplay and the abstract and didn't play by the rules was labeled as having a 'learning disability'. Its like all of our diagnoses du jour these days--A kid daydreams or might not listen to an authority figure as children are wont to do, automatically has Attention Deficit Disorder. You have a day where you're in a great mood, then you have a crappy day and are a bit sullen, and voila, you're Bipolar.