It’s fair to say that most of us apprehend Jane Austen by way of words. But for a few outliers, numbers may provide a way into her work. As we count down toward The Big Birthday next month, this week in Austen 250 celebrations offers something for both camps:   * For the linguistically inclined, the University of Western Australia, in Perth, is holding a mini-Austen conference next Monday, featuring an opportunity to view its library’s collection of Austen first editions.