[129] The party mistook this "highest peak" for Pike's Peak. This mountain, called by the French trappers _Les deux Oreilles_ (Two Ears), is the one now known as Long's Peak, being named for Major S. H. Long, the leader of our party. Frémont found in 1842 that this name had been adopted by the traders, and had become familiar in the country. The elevation of Long's Peak is 14,271 feet, exceeding that of Pike's Peak by one hundred and twenty-four feet.—ED. July 1st. Although the temperature indicated by the thermometer for several days had been about 80°, in the middle of the day, the heat, owing to the cool breezes from the mountain, had been by no means oppressive. On the night of the 30th of June, the mercury fell to 55°, and on the following morning the air was chilly, and a strong breeze was felt before sunrise, from the south-east. We left our camp at a very early hour, and travelled over a tract differing in no respect but its greater barrenness from that passed on the preceding day. We halted to dine at the distance of sixteen and a half miles. Many acres of this plain had not vegetation enough to communicate {178} to the surface the least shade of green; a few dwarfish sunflowers and grasses, which had grown here in the early part of the summer, being now entirely withered and brown. In stagnant pools near the river, we saw the common arrow head, (sagittaria sagittifolia,) the alisma plantago, and the small lemna growing together, as in similar situations in the eastern states. A striking feature of that part of the plain country, we were now passing, is formed by innumerable ant-heaps, rising from twelve to eighteen inches above the common level of the surface. They occur with some uniformity, at intervals of about twenty feet, and are all similar in size and dimensions. They consist so entirely of small grains of flesh-coloured felspar, that they have, all of them, an uniform reddish aspect, and it is not without careful examination, that any other kind of gravel can be detected in them. The entrance to the interior of each of these little mounds is uniformly on the eastward side, and very rarely occurs beyond the boundaries of N. E. and S. E. It is never at the top, nor on a level with the surface of the soil, but is a little elevated above it. It seems highly probable, that the active little architects thus place the entrance of their edifice on the eastward side, in order to escape the direct influence of the cold mountain winds.