the Tarhigang, near the Sutledge, north of Shipke, to the height of 19,411 feet, he still had, after having broken three barometers, four equally correct ones remaining.[M] Frémont, in the expedition which he made between the years 1842 and 1844, at the command of the United States Government, discovered and measured barometrically the highest peak of the whole chain of the Rocky Mountains to the north-north-west of Spanish, James’, Long’s, and Laramie’s Peaks. This snow-covered summit, which belongs to the group of the Wind River Mountains, bears the name of Frémont’s Peak on the great chart published under the direction of Colonel Abert, chief of the topographical department at Washington. This point is situated in the parallel of 43° 10′ north lat., and 110° 7′ west long., and therefore nearly 5° 30′ north of Spanish Peak. The elevation of Frémont’s Peak, which according to direct measurement is 13,568 feet, must therefore exceed by 2072 feet that given by Long to James’ Peak, which would appear from its position to be identical with Pike’s Peak, as given in the map above referred to. The Wind River Mountains constitute the dividing ridge (_divortia aquarum_) between the two seas. “From the summit,” says Captain Frémont in his official report,[N] “we saw on the one side numerous lakes and streams, the sources of the Rio Colorado, which carries its waters through the Californian Gulf to the South Sea; on the other, the deep valley of the Wind River, where lie the sources of the Yellowstone River, one of the main branches of the Missouri which unites with the Mississippi at St. Louis. Far to the north-west we could just discover the snowy heads of the Trois Tetons, which give rise to the true sources of the Missouri not far from the primitive stream of the Oregon or Columbia river, which is known under the name of Snake River, or Lewis Fork.” To the surprise of the adventurous travellers, the summit of Frémont’s Peak was found to be visited by bees. It is probable that these insects, like the butterflies which I found at far higher elevations in the chain of the Andes, and also within the limits of perpetual snow, had been involuntarily drawn thither by ascending currents of air. I have even seen large winged lepidoptera, which had been carried far out to sea by land-winds, drop on the ship deck at a considerable distance from land in the South Sea.