When I get a little money I buy books; and if any is left I buy food and clothes. -- Erasmus One afternoon in Cape Town I sat in my little room at University House and took inventory. This must have been in June, winter in the southern hemisphere, and it had been raining steadily for most of a week. I was virtually alone in the student residence; the others had packed off for vacation. With an umbrella and plastic slicker I'd ventured out once or twice to the Pig and Whistle, where I favored…