Lower-left is a sign on a post that leans slightly to the pool it names, but here just beyond (or below) the threhold of being legible. The second and shorter word of two most likely reads “pool.” Shaped something like a liver, with the color of jade, it has an outlet on the right and seems to be boiling or bubbling on the left. The steam rising on the left may have through some years got to the forest surrounding the pool and felled the trees standing closest to it so that some are bleached and some reach the pool. Perhaps this is one of the lesser attractions at Yellowstone National Park, a sauna or hot tub for bad bears. Horace does not tell us.