Yesterday was Bastille Day, which is hard to miss if you happen to be in France. There are parades and patriotic speeches in every town and village, and often fireworks and festive dinners too. This year's celebration marked the two hundred and twenty-fourth anniversary of the French Revolution, and it had a special poignancy because of the ongoing turmoil in Egypt. Revolutions have a way of going wrong, or going nowhere, but this doesn't seem in any way to diminish their popularity. The Arab Spring has produced a whole series of popular uprisings since 2010, with no very clear result.