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11th—10 miles to Soda springs, and 1 farther to camp, making 11 miles. Have traveld over volcanic rocks, to-day, the first I have seen on our route. Near to camp and north of it, near the base of the mountain, are three small craters, apparently, of extinct volcanoes. They may, however, be the craters of some of those silent springs.

12th—23½ miles to the head waters of Portneuf, a tributary of Snake river. It runs in a very circuitous manner.

1067½

13th—21 miles, over a mountainous road, to camp. Little grass, no wood but willows.

14th—16 miles to camp, about 4 miles east of Fort Hall in a large plain, coverd over a considerable portion of it with a heavy growth of wild sage. This plain is very extensive, reaching from north to south, probably nearly 100 miles. The Sheep mountain and three butes are seen from the fort, a considerable distance to the north of it, rising abruptly from the plain. To the east, south and south-west, mountains are seen from the fort, serrating the horizon. The rest of the horizon around presents nearly an unbroken expanse. This plain is waterd with several springs and streams of considerable size, some of them rising from the level plain and passing on to join the waters of the Snake or Lewis river. The Snake is a fine river, rising in the Wind River mountains, north of Fort Hall, and passing near to it in a southerly direction, where it is joind by the Portneuf about 9 miles below the fort, with other tributaries along the plain. Thence, bending its course westwardly for more than 100 miles, after which its course is northward till it falls into the Columbia river.