I had been dining with Erskine in his pretty little house in Birdcage Walk, and we were sitting in the library over our coffee and cigarettes, when the question of literary forgeries happened to turn up in conversation.  I cannot at present remember how it was that we struck upon this somewhat curious topic, as it was at that time, but I know that we had a long discussion about Macpherson, Ireland, and Chatterton, and that with regard to the last I insisted that his so-called............