But, a few days later, the party passed out of this inhospitable region, and, after passing a stream which they named Thompson’s (now Birch) Creek, after one of their men, they were glad to make this entry in their diary: “Here the country assumed a totally different aspect: the hills retired on both sides from the river, which spreads to more than three times its former size, and is filled with a number of small handsome islands covered with cottonwood. The low grounds on its banks are again wide, fertile, and enriched with trees: those on the north are particularly wide, the hills being comparatively low, and opening into three large valleys, which extend themselves for a considerable distance towards the north. These appearances of vegetation are delightful after the dreary hills among which we have passed; and we have now to congratulate ourselves at having escaped from the last ridges of the Black Mountains. On leaving Thompson’s Creek we passed two small islands, and at twenty-three miles’ distance encamped among some timber; on the north, opposite to a small creek, which we named Bull Creek. The bighorn are in great quantities, and must bring forth their young at a very early season, as they are now half grown. One of the party saw a large bear also; but, being at a distance from the river, and having no timber to conceal him, he would not venture to fire.” A curious adventure happened on the twenty-eighth, of which the journal, next day, makes this mention:-- “Last night we were alarmed by a new sort of enemy. A buffalo swam over from the opposite side, and to the spot where lay one of our canoes, over which he clambered to the shore: then, taking fright, he ran full speed up the bank towards our fires, and passed within eighteen inches of the heads of some of the men before the sentinel could make him change his course. Still more alarmed, he ran down between four fires, and within a few inches of the heads of a second row of the men, and would have broken into our lodge if the barking of the dog had not stopped him. He suddenly turned to the right, and was out of sight in a moment, leaving us all in confusion, every one seizing his rifle and inquiring the cause of the alarm. On learning what had happened, we had to rejoice at suffering no more injury than some damage to the guns that were in the canoe which the buffalo crossed. . . .