It was a strange place--the icy rock and the highest peak of the Rocky Mountains--for a lover of warm sunshine and flowers; and we pleased ourselves with the idea that he was the first of his species to cross the mountain barrier, a solitary pioneer to foretell the advance of civilization. I believe that a moment’s thought would have made us let him continue his way unharmed; but we carried out the law of this country, where all animated nature seems at war, and, seizing him immediately, put him in at least a fit place,--in the leaves of a large book, among the flowers we had collected on our way. The barometer stood at 18.293, the attached thermometer at 44°, giving for the elevation of this summit 13,570 feet above the Gulf of Mexico, which may be called the highest flight of the bee. It is certainly the highest known flight of that insect. From the description given by Mackenzie of the mountains where he crossed them with that of a French officer still farther to the north and Colonel Long’s measurements to the south, joined to the opinion of the oldest traders of the country, it is presumed that this is the highest peak of the Rocky Mountains. The day was sunny and bright, but a slight shining mist hung over the lower plains, which interfered with our view of the surrounding country. On one side we overlooked innumerable lakes and streams, the spring of the Colorado of the Gulf of California; and on the other was the Wind River Valley, where were the heads of the Yellowstone branch of the Missouri. Far to the north we just could discover the snowy heads of the _Trois Tetons_, where were the sources of the Missouri and Columbia Rivers; and at the southern extremity of the ridge the peaks were plainly visible, among which were some of the springs of the Nebraska or Platte River. Around us the whole scene had one main striking feature, which was that of terrible convulsion. Parallel to its length, the ridge was split into chasms and fissures, between which rose the thin, lofty walls, terminated with slender minarets and columns, which could be clearly discerned from the camp on Island Lake. According to the barometer, the little crest of the wall on which we stood was three thousand five hundred and seventy feet above that place and two thousand seven hundred and eighty above the little lakes at the bottom, immediately at our feet. Our camp at the Two Hills (an astronomical station) bore south 3° east, which with a bearing afterward obtained from a fixed position enabled us to locate the peak. The bearing of the _Trois Tetons_ was north 50° west, and the direction of the central ridge of the Wind River Mountains south 39° east. The summit rock was gneiss, succeeded by sienitic gneiss. Sienite and feldspar succeeded in our descent to the snow line, where we found a feldspathic granite. I had remarked that the noise produced by the explosion of our pistols had the usual degree of loudness, but was not