The great age of the Scottish autodidact must have ended a century ago, but it had a prodigious impact while it lasted. To read John Gross’s The Rise and Fall of the Man of Letters (1969) is to be plunged headfirst into a world of kenspeckle lads studying Nietzsche behind the crankshaft and miners quoting Burns to each other as they were winched up from the Lanarkshire coal face.