Note U — Front matter

This story, which is taken from the report of Captain W. F. Raynolds, was one of Bridger’s favorites, and it is even said that he did not regard it as pleasantry at all, but as plain matter of fact. Mr. Langford, who often heard him relate it, says that he generally described the stream as flowing over the smooth surface of a rock, and reasoned that, as two sticks rubbed together produce heat by friction, so the water rubbing over the rock became hot. In proof, he cited an instance where the water was hot only in close proximity to the rock and not at the surface. Mr. Langford found a partial confirmation of the fact, but not of the theory, in fording the Firehole River in 1870. He passed over the smooth deposit of an active hot spring in the bed of the stream, and found that the stream bottom and the water in contact with it were hot.