My back itches. One can clearly distinguish between itches caused by perspiration and itches caused by creeping fleas. If the site of the itch lies within reach of my mouth, I can bite the cause, and if within reach of my feet, I know precisely how to scratch it. But if the irritation is at the midpoint of my spine, I simply can’t get at it. In such a case, one must either frot oneself on the first available human being or scrape one’s back against a pine tree’s bark.
