Friday, September 2.—­To-day we have occupied ourselves in examining the springs and other wonders at this point.  At the base of the foot-hills adjoining our camp are three large springs of thick boiling mud, the largest of which resembles an immense cauldron.  It is about thirty feet in diameter, bordered by a rim several feet wide, upon which one can stand within reach of the boiling mass of mud, the surface of which is four or five feet below the rim enclosing it, the rim being a little raised above the surrounding level.  Some twelve or fifteen rods from this spring are two other springs from ten to twelve feet in diameter.  Near by is a hot (not boiling) spring of sulphur, fifteen to eighteen feet in diameter, too hot to bathe in.  From these we passed over the timbered hill at the base of which these springs are situated.  In the timber along the brow of the hill and near its summit, and immediately under the living trees, the hot sulphur vapor and steam issue from several fissures or craters, showing that the hottest fires are raging at some point beneath the surface crust, which in a great many places gives forth a hollow sound as we pass over it.  Through a little coulee on the other side of the hill runs a small stream of greenish water, which issues from a small cavern, the mouth of which is about five feet high and the same dimension in width.  From the mouth, the roof of the cavern descends at an angle of about fifteen degrees, till at the distance of twenty feet from the entrance it joins the surface of the water.  The bottom of the cavern under the water seems to descend at about the same angle, but as the water is in constant ebullition, we cannot determine this fact accurately.  The water is thrown out in regular spasmodic jets, the pulsations occurring once in ten or twelve seconds.  The sides and mouth of this cavern are covered with a dark green deposit, some of which we have taken with us for analysis.  About two hundred yards farther on is another geyser, the flow of which occurs about every six hours, and when the crater is full the diameter of the surface is about fourteen feet, the sides of the crater being of an irregular funnelshape, and descending at an angle of about forty-five degrees.  At the lowest point at which we saw the water it was about seven feet in diameter on the surface.  One or another of our party watched the gradual rise of the water for four or five hours.  The boiling commenced when the water had risen half way to the surface, occasionally breaking forth with great violence.  When the water had reached its full height in the basin, the stream was thrown up with great force to a height of from twenty to thirty feet, the column being from seven to ten feet in diameter at the midway height of the column, from bottom to top.  The water was of a dark lead color, and those portions of the sides of the crater that were overflowed and then exposed by the rise and fall of the water were covered with stalagmites formed by the deposit from the geyser.