here is evidently of volcano formation. The ground in every direction, is cut with deep fissures; and all the rocks and pebbles are pumice stones. Stones as large as a watermelon we could easily pick up and toss into the air with one hand. The station is named from a number of 'mud springs' which are near it. We visited one not far from the railroad track. The crater was about forty feet across, and we went down about ten feet to the surface of the spring. It was apparently liquid mud with some kind of gas bubbling up all over the surface. Near the edge the mud was more solid and the gas came up through cracks. Upon stopping up the cracks, the gas either removed the obstruction, or forced a new passage. There were both hot and cold springs around there; this one happened to be cold. The gas had a peculiarly unpleasant odor, and, what surprised us very much, extinguished flames held over it. In the crater there were several birds that had been overcome by the fumes. Every morning we watched the mountains in the distance with a great deal of curiosity, as the mirage causes them to change shape continually until the sun is high in the heavens. Every day, on our right hand, at what seems to be a distance of about three miles, there is apparently a large sheet of water. It is there every day, just the same, and the section men call it 'Salton Sea', but there is, of course, no water for many miles. After leaving Volcano Springs the road was better, but very sandy. We saw very few birds. A few Shore larks, some Ravens, and a few sparrows apparently allied to Belli. We arrived at Flowing Hills late in the evening.