Jones, who was a student of economy, lamented the death of his horse. His friend sympathised and enquired the cause. "He was a wonderful horse, and if he had lived another day he would have proved a theory I have been pursuing." "How is that?" "Well, you see," replied Jones, "I reckon that it's all nonsense about having to spend so much on a horse's keep. I started this one with the ordinary feed, but gradually reduced the quantity." "And what did he have yesterday?" "Well, I'd got him down to one oat."